Question can Spen option cause screen flickring? - Samsung Galaxy S21 Ultra

Hello friends
i have S21 ultra exynos version, when i turn on Spen option in setting the top off screen is start to flickring (Small white horizontal lines difficult to see easily with the eye but it is visible when i focusing vision) its like vibrations when we bring a metal object closer to an old TV screen.
when i turn off the spen setting the screen its become normal
so any one can confirm that for me its normal that i see this or not? tnx in advance

I think it needs degaussed
Not normal for Notes. May be a firmware glitch, try at different refresh rates.
Try a hard reboot and clear the system cache.

blackhawk said:
I think it needs degaussed
Not normal for Notes. May be a firmware glitch, try at different refresh rates.
Try a hard reboot and clear the system cache.
Click to expand...
Click to collapse
hahaha tnk for your answer
i try what you writing :
1: i try 120 hrz and the screen become normal i try my spen and all is normal no flickring after 120 hz
2 : i try to back to 60 hz and the surprise is all is normal all thing is good
3 : i back to 120 hz and i try turn on and off (spen) in setting the screen is norml
4 : i try back to 60 hz and try to turn on and off (spen) the problem is back again but when i put the s pen in the screen the white line is disappear when I pick up the spen the problem is back again(just for 60 hz)
i dont know whats the probleme here my friend

znayver said:
hahaha tnk for your answer
i try what you writing :
1: i try 120 hrz and the screen become normal i try my spen and all is normal no flickring after 120 hz
2 : i try to back to 60 hz and the surprise is all is normal all thing is good
3 : i back to 120 hz and i try turn on and off (spen) in setting the screen is norml
4 : i try back to 60 hz and try to turn on and off (spen) the problem is back again but when i put the s pen in the screen the white line is disappear when I pick up the spen the problem is back again(just for 60 hz)
i dont know whats the probleme here my friend
Click to expand...
Click to collapse
CRT's were fun. Got shocked more than once.
One time when I was replacing a huge one even though I had discharged it several times to no spark. Capacity memory is scary. Fortunately I didn't drop it, that could've ended up badly.
Sounds like firmware. The variable refresh rate displays are extremely hard to calibrate. It's bad enough trying to color/gamma calibrate at fixed rate display through its brightness range. It's near impossible on variable refresh rate displays.
I would just ignore it unless it gets worse*. If under warranty maybe then otherwise the cure maybe worse than the disease. There maybe other work arounds or use the one you found or the easiest... just ignore it. If it's not a major issues don't go too nuts.
*It's possible the rom got corrupted (single event upset) or one of millions of the transistor or mosfet junctions failed in the mobo or display matrix. Every wonder what happens when one or two fail?

blackhawk said:
CRT's were fun. Got shocked more than once.
One time when I was replacing a huge one even though I had discharged it several times to no spark. Capacity memory is scary. Fortunately I didn't drop it, that could've ended up badly.
Sounds like firmware. The variable refresh rate displays are extremely hard to calibrate. It's bad enough trying to color/gamma calibrate at fixed rate display through its brightness range. It's near impossible on variable refresh rate displays.
I would just ignore it unless it gets worse*. If under warranty maybe then otherwise the cure maybe worse than the disease. There maybe other work arounds or use the one you found or the easiest... just ignore it. If it's not a major issues don't go too nuts.
*It's possible the rom got corrupted (single event upset) or one of millions of the transistor or mosfet junctions failed in the mobo or display matrix. Every wonder what happens when one or two faiso
Click to expand...
Click to collapse
blackhawk said:
CRT's were fun. Got shocked more than once.
One time when I was replacing a huge one even though I had discharged it several times to no spark. Capacity memory is scary. Fortunately I didn't drop it, that could've ended up badly.
Sounds like firmware. The variable refresh rate displays are extremely hard to calibrate. It's bad enough trying to color/gamma calibrate at fixed rate display through its brightness range. It's near impossible on variable refresh rate displays.
I would just ignore it unless it gets worse*. If under warranty maybe then otherwise the cure maybe worse than the disease. There maybe other work arounds or use the one you found or the easiest... just ignore it. If it's not a major issues don't go too nuts.
*It's possible the rom got corrupted (single event upset) or one of millions of the transistor or mosfet junctions failed in the mobo or display matrix. Every wonder what happens when one or two fail?
Click to expand...
Click to collapse
no my friend i dont have warranty now..but the phone is in a good condition 99% i just bought it last 2 weeks i do a factory reset when i bought it iam at the latest firmware android 12 october security patch.
when i try your solution ..when iam at 120 no probleme at all condition all is good and normal see my old post.
when i switch from 120 to 60 no probleme but if i turn on and off (spen) the probleme is here..i cant describe the screen hhahaha its like when we get close to an old tv and your phone is near to tv and you receive a call the screen start to flickring with horizontal lines..but its not easy to see it you should focus a little bit in the screen

znayver said:
no my friend i dont have warranty now..but the phone is in a good condition 99% i just bought it last 2 weeks i do a factory reset when i bought it iam at the latest firmware android 12 october security patch.
when i try your solution ..when iam at 120 no probleme at all condition all is good and normal see my old post.
when i switch from 120 to 60 no probleme but if i turn on and off (spen) the probleme is here..i cant describe the screen hhahaha its like when we get close to an old tv and your phone is near to tv and you receive a call the screen start to flickring with horizontal lines..but its not easy to see it you should focus a little bit in the screen
Click to expand...
Click to collapse
If you take a screen shot of it:
If it shows on the shot it's the firmware or mobo
If it doesn't show it's the display
Can you return it do a charge back on the card used to buy it?

blackhawk said:
If you take a screen shot of it:
If it shows on the shot it's the firmware or mobo
If it doesn't show it's the display
Can you return it do a charge back on the card used to buy it?
Click to expand...
Click to collapse
I take screenshot and screen recorder..its not shows...
yes i can change it but he dont have another s21U...iam just asked here to be sure its a display or fimware problem or just a probleme off 120hz and 60 hz and its normal to see it...if all people have this its not a good idea to change my S21U...bcz the problem not appear in 120hz and not appear at 60 hz in some conditions Just like I explained to you ..so i need a friend here to do a test in a same phone at white screen like notes application or messages and at this time i choose my decision to change it or not

znayver said:
I take screenshot and screen recorder..its not shows...
yes i can change it but he dont have another s21U...iam just asked here to be sure its a display or fimware problem or just a probleme off 120hz and 60 hz and its normal to see it...if all people have this its not a good idea to change my S21U...bcz the problem not appear in 120hz and not appear at 60 hz in some conditions Just like I explained to you ..so i need a friend here to do a test in a same phone at white screen like notes application or messages and at this time i choose my decision to change it or not
Click to expand...
Click to collapse
It may be the display. The active matrix is packed to the gills with mosfet junctions.
Try some Google searches; it will likely show up on Samsung members forum if it's an issue.
Take an image of it and do a Google image search if possible.

blackhawk said:
It may be the display. The active matrix is packed to the gills with mosfet junctions.
Try some Google searches; it will likely show up on Samsung members forum if it's an issue.
Take an image of it and do a Google image search if possible.
Click to expand...
Click to collapse
okeey my friend ill try and i post here any news..tnx a lot for your help

Related

S2U2 Burned in my screen!!

Hi Guys!
I have a Touch Pro, but i thought I post here, because it's acually the same phone, and here it's more crowded..
I installed S2U2 2 days ago, and just now after waking up the device I saw S2U2 flickering in the background. Like it was a flickering transparant overlay.
So I turn off the device, and turn it back on..
Then when I got the Touch Pro logo (Pre-windows!!) I saw S2U2 stiill overlaying the screen!!!
So my conclusion is: S2U2 Burned in my screen, so if you have it installed i'd suggest removing it before it trashes your display!..
I'm going to return my phone.. hoping they'll repair it..
Cant take photos now.. but will do when i get home...
Edit.. Sorry guys.. changed my conclusion! S2U2 is not guilty.. TouchPro's/Diamond's display is
Sounds scary. Could you post a photo?
Found some information about this.. Thought it would be nice to share, since I will not be the only and the last one with this problem:
TFT monitors don't suffer from burned-in images.. But they do suffer from "retained pixel charge".. this will cause "Ghost images" (like mine)
More info HERE
Is Image-Sticking Reversible?
Unlike permanent burn-in in phosphor-based displays, which is the result of a premature aging of the phosphors of individual pixels, and thus, is irreversible, image sticking in LCD panels can often be reversed to a point of total invisibility.
However, the extent to which image sticking can be reversed depends on the severity of the causes that eventually led to image retention; top in the list is the environmental temperature at which image sticking took place.
A way to remove a retained image on an LCD panel is to run an all-white screen saver for several hours. It would generally help if this image sticking reversal operation were run at an elevated temperature of around 100 deg. Fahrenheit or 40 deg. Celsius. This should help speed up the reversal process.
Some manufactures would recommend instead using an all-back or dark gray pattern screen saver. Whichever method you choose, make sure the LCD TV or monitor energy savings settings will not turn the backlight off after some time of inactivity.
Other manufacturers would recommend turning off the LCD display for a longer period than the time it took for the static image to cause image retention.
While all three methods can help to remove image sticking, yet our best advice is to follow the manufacturer's instructions whenever these are available.
Click to expand...
Click to collapse
Seems like it will go away when I turn off the screen for a while..
So let's do that, and I'll keep you posted!
damn, try this on your diamond browser:
http://www.jscreenfix.com/basic.php
click the link on the bottom of that page after reading
Thanks! but the applet doesn't work on the mobile browser..
But i've created an avi of it (it works on the pc so Print Screen )
I will play that a couple of times!
Will keep you posted!
oh my god...
i can't understand how it happens.
do you turn off the screen while locked?
[i don't think it's a problem of s2u2...]
I don't think it's S2U2's fault either.. Usualy I turn the screen off. but today while charging through usb, maybe it stayed on, I didn't pay any attention it acually..
I made an wmv file with some flickering screens to stress the tft/lcd screen.. looks like it worked.. stressed it for nearly an hour and it looks gone..
I'll look for somewhere to upload it.. maybe someone else can use it too!
edit: here it is.. :
Click here to open the wmv, right-click save as to save it
g8 work man.
i wait a definitive release of sensorlock, so i'm using s2u2
but i pay attention to switch off the screen ALWAYS
Hakko said:
Found some information about this.. Thought it would be nice to share, since I will not be the only and the last one with this problem:
TFT monitors don't suffer from burned-in images.. But they do suffer from "retained pixel charge".. this will cause "Ghost images" (like mine)
Click to expand...
Click to collapse
Was just about to say that! Atleast the part with TFT cant be burned-in.
Hakko said:
I made an wmv file with some flickering screens to stress the tft/lcd screen.. looks like it worked.. stressed it for nearly an hour and it looks gone.. [/URL]
Click to expand...
Click to collapse
You needn't have done - see my related article and the video file inside.

Sick of samsung's bad displays

So my display after being replaced 2 times in 6 months started flickering. My phone is very hard to be turned on because of the green flickering.
I just want to upgrade to a S6,S7 Edge or non edge. i just want to know if they have the save problem with displays ? I want to have a phone at least 2 years, can you recommand me a phone like that ?
I was just considering switching to a iPhone even though i prefer android on phones ... o how are S6,S7s displays ? Samsung still have the same problems?
Samsung improved a lot on screen quality in S6 and after, so you should be okay
Dieexe said:
Samsung improved a lot on screen quality in S6 and after, so you should be okay
Click to expand...
Click to collapse
So no more sudden flickering problem ? I mean i didnt even dropped the phone or something like that.
RootNightmareX said:
So my display after being replaced 2 times in 6 months started flickering. My phone is very hard to be turned on because of the green flickering.
I just want to upgrade to a S6,S7 Edge or non edge. i just want to know if they have the save problem with displays ? I want to have a phone at least 2 years, can you recommand me a phone like that ?
I was just considering switching to a iPhone even though i prefer android on phones ... o how are S6,S7s displays ? Samsung still have the same problems?
Click to expand...
Click to collapse
green flickering problem just for auto brightness problem (some custom Roms have this issues) if u will untick the auto brightness u will not have this problem
Not really, it has more issues on this "display green flickering " , on my S5 i dont get display on if the temperature around it getting cold .
Sent from my Samsung Galaxy S5 using XDA Labs
atakan1986 said:
Not really, it has more issues on this "display green flickering " , on my S5 i dont get display on if the temperature around it getting cold .
Sent from my Samsung Galaxy S5 using XDA Labs
Click to expand...
Click to collapse
Wow that's amazing. Been using samsung s5 exynos version for the last 1yr. Never had that kind of problem till date. And it have the same display as snapdragon version. And on comparison I found that this is by far the best display out there when compared to other brands.
Maybe perhaps you might be having a faulty unit from the begining.
Sent from my SM-G900H using Tapatalk
I have the same problem here with the display and it's not a software problem (same by original os 6 and same by cyanogenmod 14).
After the temperatures are under 10 C. i can't open my s5 with home button i must do it over the power button.
Using S5 for more than 28 months still I have not faced any issue. I just had to buy new charger apart from that not a single problem and yes I mess up with my phone so much but I still working and no display failure yet. And also I have dropped it many times, it still refuses to die.
You are just having a defective model or some internals of the phone are messed up. Because Samsh*t produces one of the best displays..
shurupi said:
I have the same problem here with the display and it's not a software problem (same by original os 6 and same by cyanogenmod 14).
After the temperatures are under 10 C. i can't open my s5 with home button i must do it over the power button.
Click to expand...
Click to collapse
So when its over 10C its ok ? Then i should sell the phone when its summer )
nikhil007.n2 said:
Using S5 for more than 28 months still I have not faced any issue. I just had to buy new charger apart from that not a single problem and yes I mess up with my phone so much but I still working and no display failure yet. And also I have dropped it many times, it still refuses to die.
You are just having a defective model or some internals of the phone are messed up. Because Samsh*t produces one of the best displays..
Click to expand...
Click to collapse
At least for s5, the internet is full of this faulty displays, even my friends have same problem.
RootNightmareX said:
So when its over 10C its ok ? Then i should sell the phone when its summer )
Click to expand...
Click to collapse
Very simple but good idea my friend : )
Sent from my Samsung Galaxy S5 using XDA Labs
RootNightmareX said:
At least for s5, the internet is full of this faulty displays, even my friends have same problem.
Click to expand...
Click to collapse
This may be problem for Snapdragon variant then.
nikhil007.n2 said:
This may be problem for Snapdragon variant then.
Click to expand...
Click to collapse
Maybe thats a point, but shouldnt only the processor be different? I assume the display is.the same for both...
nikhil007.n2 said:
This may be problem for Snapdragon variant then.
Click to expand...
Click to collapse
Nope, Exynos variant have this same problem
Im also facing green flickering and blinking at low brightness.
Sent from mySM-G900F using Tapatalk
baseer_IF said:
Im also facing green flickering and blinking at low brightness.
Sent from mySM-G900F using Tapatalk
Click to expand...
Click to collapse
Its not a good sign. Try disabling your light sensor. Even then if you experience such a problem than it means that your flex cable that attaches the screen with the motherboard needs to be changed.
Sent from my SM-G900H using Tapatalk
redhotiron2004 said:
Its not a good sign. Try disabling your light sensor. Even then if you experience such a problem than it means that your flex cable that attaches the screen with the motherboard needs to be changed.
Sent from my SM-G900H using Tapatalk
Click to expand...
Click to collapse
I try to disable Auto brightness. but in manual the problem is persist when when brightness is full low .
if brightness is normal it is normal
Sent from my SM-N9300 using Tapatalk
RootNightmareX said:
At least for s5, the internet is full of this faulty displays, even my friends have same problem.
Click to expand...
Click to collapse
Hi,
Yes and expect the same problems with the following generations. It's an amoled screen thing. The green colour happen when there's a colour displayed on the screen for a very long time (for example, I have a green on my screen of the size of my keyboard).
I think a solution to this problem is to set the display to turn off after 30s (it saves battery too) and maybe, if you're using a custom keyboard, change the colour from time to time. Use the brightness of the screen to a lowest which would still be comfortable to you (and auto unticked).
This last tip alone is enough to prevent greening. My flickering happened after an incredible fall (it had a tempered glass so the screen was safe). The flickering showed green what it had in memory.
Samsung has a 2-year guarantee for its products so you shouldn't worry for that period of time. Problem not solved, replacement.
Best of luck
Superlion721 said:
Hi,
Yes and expect the same problems with the following generations. It's an amoled screen thing. The green colour happen when there's a colour displayed on the screen for a very long time (for example, I have a green on my screen of the size of my keyboard).
I think a solution to this problem is to set the display to turn off after 30s (it saves battery too) and maybe, if you're using a custom keyboard, change the colour from time to time. Use the brightness of the screen to a lowest which would still be comfortable to you (and auto unticked).
This last tip alone is enough to prevent greening. My flickering happened after an incredible fall (it had a tempered glass so the screen was safe). The flickering showed green what it had in memory.
Samsung has a 2-year guarantee for its products so you shouldn't worry for that period of time. Problem not solved, replacement.
Best of luck
Click to expand...
Click to collapse
The funny thing is i already did "by mistake" all the tips you said and still have this. Never dropped the phone though. This problems seems very big though, i expected a burn in to be the biggest problem, but to have flickering at a level that i cant turn on the phone. I wanted recently to switch to a Nexus 6p, but knowing that it uses Amoled too, its a bad ideea. So the only "solution" is to switch to IPS screens? (btw i want a phone that holds on for at least 3 years)
In my research thus far, the AMOLED screen technology is to blame. When the display circuits get old or damaged, they don't sustain current at low power settings. In LED screens, a back light controls brightness, but AMOLED screens send current to each pixel for brightness control. If the circuit is damaged, or any corrosion has built up inside, this could attenuate the current below the point required to sustain light flow. I see this problem with some LED and CFL lights on motion sensor switches. Just enough current goes through the motion sensor to keep it's circuits active, and that current causes a flicker in the light.
With the screen though, since the problem is only resolved when you increase the brightness just a bit above minimum, it seems anything that lowers the display power (auto brightness for example) will cause it to flicker if this setting gets too low. I also noticed that before the screen locks on timer, it dims to low power for a few seconds and flickers as a result. There are apps that attempt to resolve this by putting a translucent black screen over your desktop and apps. This keeps the power up on the pixels but adds a black overlay, kind of like a screen filter. You can adjust the darkness if you need it to save your eyes when reading in the dark but it doesn't help save power any. They also require a rooted device, which could void warranties. The reason for this I believe is because apps are supposed to operate in a way they don't intrude on each other, and a filter that lays over your screen does in fact alter the output of your display rendering. With the added security concerns of these apps possibly collecting screen shots and sending them to another site, I would avoid this. Best to use a physical screen overlay you can put on or remove as needed as long as it doesn't interfere with your touch screen options.
Ultimately, these devices were meant for replacement every 2 to 3 years so if you're like me and you like to make your investment last, best thing to do is apply any work around you can come up with. A repair shop may be able to wipe the circuit boards down with a solution that clears away corrosion, but it won't repair any weakened pixels. I'm still using a Samsung S5 G900F
- And i finally got this fixed. it sounds like the reason for this is that since the latest update your phone cannot decide whether to use hardware or software back light settings. I managed to make the problem go away by doing this:
Go to settings >> system >> About device.
Find "Build number" and click 6 times fast on it.
You will then get the message saying: "You are now a developer"
and then go back to Settings >> system >> Now you will see the "Developer Options"
Now go to Developer options >> Drawing Section or Rendering Section >> Find "Turn off hardware overlays" or "disable hardware overlays" >> This will force the phone to always use GPU for screen adjustments. no more flickering.
but If I turn the brightness ALL the way down, it still flickers like crazy, however, if that's the only time it'll do it, I consider that a win.
Read More :good:

Huawei P30 Pro Burn In Issue Question

Hi all,
I want to find out if heavy usage of youtube on this phone will cause Screen Burn In?
Heavy usage = Always on youtube. At least 8 to 10 hours of youtube per day.
Unless all the videos have the same static image (or its the same video on loop) screen burn is unlikely. The only issue would likely be the video not filling the screen leaving black bars down the side which could burn in. I'd recommend zooming in the video to fill the screen to avoid that.
That would mean there will still be burn in. ???????
RaiderX303 said:
Unless all the videos have the same static image (or its the same video on loop) screen burn is unlikely. The only issue would likely be the video not filling the screen leaving black bars down the side which could burn in. I'd recommend zooming in the video to fill the screen to avoid that.
Click to expand...
Click to collapse
isnt it an amoled display, meaning the black bars would just be the leds turned off meaning no burn in?
I use you tube a fair bit, maybe not to the extent the OP uses but a good few hours, and not even a hint of burn in
They would burn in eventually as the black bars are getting less use than the video area so they'd be brighter than the rest of the display
My experience with burn in is that I had to go change the front panel 4 times in One Year (Samsung). I am now afraid to buy a new phone because I don't want to have to go to the service centre 4-5 times in one year. Just wanted to find out if Huawei also would get such issue. And don't know if Huawei cover such issue in their warranty.
kljs said:
My experience with burn in is that I had to go change the front panel 4 times in One Year (Samsung). I am now afraid to buy a new phone because I don't want to have to go to the service centre 4-5 times in one year. Just wanted to find out if Huawei also would get such issue. And don't know if Huawei cover such issue in their warranty.
Click to expand...
Click to collapse
It's going to happen on any Amoled screen if you leave the same image on for long periods of time, nothing to do with the manufacturer of the device, the displays are rarely made by the same OEM as the device anyway
Turn brightness down and don't leave the same image on the screen, turn it off when not using it
I would recomend you to use "Youtube Vanced" as it has built in "background playback" and completly black theme and you can also turn the screen off during video playback.
adamlee2012 said:
I've had my P30 PRO since July 2019 and no burn in at all. 6-8 hours screen time a day.
Click to expand...
Click to collapse
Me too, the display seems very high quality in terms of build quality....
It really depends on your personal usage. High brightness means screen burn ins will appear sooner rather then later. On my old Galaxy S4, after 3 years of usage, no burn ins. On my old Galaxy A5 2016, after 2 years, no burn ins. My girlfriend's Galaxy S9+, after 1 and a half year, full keyboard burn in. She uses her phone with brightness at maximum a lot of times while I, on the other hand, can't stand high brightness, only in direct sunlight.
It all depends on your usage.

Question True AMOLED display ? Is my device defective ?

Hi. I don't have any way to show this but my unit has what I think is backlight bleed when displaying a fully black (#000000) picture.
This bleeding is somehow especially visible at 35% (don't ask me why) and 100% brightness.
Now, it's only really visible when in the dark and when my eyes are used to it so it's not a big deal for daily use. However, this screen is supposed to be AMOLED which presumably works on the same principle of OLED displays.
My OnePlus 3T, with the same picture of a plain black background and with the brightness turned to the max shows no sign of any light whatsoever, as any true OLED display should.
My Zenfone 8 however has a weird pattern of tiny scattered dots and a few vertical lines you can barely make out all around the display and especially along the left edge of the display.
Can anyone with a Zenfone 8 check if they observe the same effect ? Like I said, it's only visible when your eyes are well accustomed to obscurity. I tried repeating the experiment yesterday when going to sleep and didn't see anything at first but I woke up later that night and sure enough, the same pattern was visible again.
In case you're doubting the file I used to test it out, here it is. A fully black pic. Of course you have to watch it in fullscreen so that no UI element can pollute your vision.
Any insight on what might be happening would be greatly appreciated.
Used your file and checked it in a pitch black place. Can't see nothing on full brightness. I still had the home-recent apps slider on the bottom but covered it with my finger. I couldn't tell where the screen is at all.
Maybe yours has some defect but if you cannot see it without hours of eyes adjustment than I think you are exaggerating quite a bit.
I've been using the LG V30 which also has OLED but it had a grey lighting always. Don't know why. This screen is much much better.
Kemez said:
Maybe yours has some defect but if you cannot see it without hours of eyes adjustment than I think you are exaggerating quite a bit.
Click to expand...
Click to collapse
It's not like I was purposely trying to find flaws in the display. I was looking for a wallpaper while in bed and as I was zooming in a picture, I noticed as if what I initially thought were color variations in the image remained static on the screen. It wasn't due to a dirty screen. In doubt, I tested with the black picture and cranked the brightness to emphasize the issue and it was clear something was up.
So even if this issue can't be seen during the day, it's still something that can be seen in normal use when using the phone in the dark.
I just went from the my PC to a dark room and tried to reproduce it with brightness at 35% and I could see it in a matter of seconds.
One of the key factors that made me buy this phone in the first place is the AMOLED display. If it's actually defective, I might as well get it replaced. I would just like to know if it's worth the hassle or if every unit has that defect maybe due to something in the manufacturing process.
Can't see anything like that on mine. Totally black everywhere. Try exchanging the phone. Or just give it back and get another so they will not try to repair it.
Thank you very much for your feedback.
The only way the pixels can light is if they have current. Otherwise they are black as night.
Bad firmware or defective hardware.
Try clearing the system cache.
My display has that too, but only at 60 and 120 hz. At 90 Hz, the Dysplay is without lighting, so black as it should.
blackhawk said:
Try clearing the system cache.
Click to expand...
Click to collapse
I don't have the option in the bootloader to reset the system cache, only "wipe data/factory reset".
I selected it thinking it would let me choose what to wipe but then it warned me about permanently deleting everything so I nope out of there.
Any other way I can do that ?
Mr.GSpecial said:
My display has that too, but only at 60 and 120 hz. At 90 Hz, the Dysplay is without lighting, so black as it should.
Click to expand...
Click to collapse
Uh, interesting. I'll give this a try as well.
Nekrozys said:
I don't have the option in the bootloader to reset the system cache, only "wipe data/factory reset".
I selected it thinking it would let me choose what to wipe but then it warned me about permanently deleting everything so I nope out of there.
Any other way I can do that ?
Click to expand...
Click to collapse
It's in Settings somewhere under storage or memory.
On Samsung's it's on the boot menu.
Lol, a factory reset will definitely clear it
Mr.GSpecial said:
My display has that too, but only at 60 and 120 hz. At 90 Hz, the Dysplay is without lighting, so black as it should.
Click to expand...
Click to collapse
That's it! I got the same behavior. Perfect black at 90hz, grey goo at 60 and 120. Since I'm not the only one, I suppose this is "normal". I guess that must be some sort of compromise they had to make for the display and they hoped people wouldn't notice.
It's a shame but at least I'm relieved knowing the screen works well at 90Hz. Since the 120Hz was not one of the key features I was looking for, this doesn't feel too bad a compromise to deal with.
Thank you everyone for your time and replies.
Interesting, I hope this is a software issue that can be fixed with an update...
Same.. When viewing black wallpaper @60/120 hz, it got scattered gray all over the place with a vertical line in the middle. Noticeable if you're in a dark room. Glad i'm not the only one
Alright, so I was able to capture a long exposure photo of the phone on a black screen. The issue appears on 60 and 120Hz like mentionned above. I found that it is more apparent on the 120Hz mode than 60Hz. 90Hz is flawless. The effect is kind of exagerrated, but it was the only way to visibly capture it.
Adaoh said:
Alright, so I was able to capture a long exposure photo of the phone on a black screen. The issue appears on 60 and 120Hz like mentionned above. I found that it is more apparent on the 120Hz mode than 60Hz. 90Hz is flawless. The effect is kind of exagerrated, but it was the only way to visibly capture it.View attachment 5350315
Click to expand...
Click to collapse
Also during restart, the "Zenfone" loading screen appears like that in dark room.
Same behavior here, 120 and 60Hz are not truly black. 90Hz is.
Quick reply to add here that for those that use the phone at 60Hz, you can enable DC Dimming, that solved the issue for my device. 120Hz still needs to be figured out though...
Adaoh said:
Quick reply to add here that for those that use the phone at 60Hz, you can enable DC Dimming, that solved the issue for my device. 120Hz still needs to be figured out though...
Click to expand...
Click to collapse
Interesting.
DC dimming can reportedly have its own drawbacks as well like skewing color rendering.
What is DC Dimming & Why it's Important for AMOLED Smartphones? - Gizmochina
OLED panels have a lot of advantages. They have better color accuracy and contrasts (including better blacks) and are thinner and brighter than traditional LCD panels. So, it’s no surprise that smartphone manufacturers are shifting to OLED panels for their smartphones. Even the mid-range ones...
www.gizmochina.com
after further investigation and trying to replicate on several ZF8's, it seems that this is a normal behavior. The questions is: is it hardware or software?

Question Picture in Picture, Split Screen etc - Refresh Rate drops to 60Hz (EXYNOS)

Hi there, I'd not noticed this before the Android 12 update, but refresh rate appears to drop from 120Hz to 60Hz when using Picture in Picture or Split Screen views. Can anyone else reproduce this please?
You can confirm this by going into developer mode and toggling to always display the refresh rate.
Try a factory reset if you haven't already and it was a OTA upgrade...
I'd rather see if others can reproduce this first - would have thought it's a simple enough thing to test and post your results here, thanks!
Hi SSJ100, I just tested this to confirm for you, it does drop to 60hz immediately and I cannot prompt it to 120hz until I return to full screen view
Further testing, if i have video running in the background, Amazon, netflix or YouTube it stays at 120 with windowed mode on
DS1000RR said:
Hi SSJ100, I just tested this to confirm for you, it does drop to 60hz immediately and I cannot prompt it to 120hz until I return to full screen view
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Click to collapse
Thanks for checking! Again though, I'm quite amazed (okay, maybe not quite the word hehe) at how no one has reported this issue in this forum (and at least one other "major" forum). If they have, please excuse my ignorance and I'd appreciate a link to the thread.
I can also confirm that this issue persists even after updating to the so-called bug fixing patch "BUKG".
DS1000RR said:
Further testing, if i have video running in the background, Amazon, netflix or YouTube it stays at 120 with windowed mode on
Click to expand...
Click to collapse
Interesting how bugs like this manifest sometimes huh hehe. I first noticed this issue with Google Maps when I was navigating with it and switching to another app (which automatically forces Google Maps app to become picture in picture mode). Scrolling looks quite different and jittery - it's amazing how one gets used to 120Hz!
Have you tried the tiles app developed by a user on here? It can force refresh rates very easily and just requires an adb permission.....there was a thread the other day
ssj100 said:
Scrolling looks quite different and jittery - it's amazing how one gets used to 120Hz!
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Click to collapse
There is some black magic going on with these 120Hz panels. 60 Hz never seemed to be a problem before these high refresh rate displays started popping up. I remember smooth as butter 60Hz phones (both iphones and android). But now when i use a 120Hz panel at a 60Hz refresh rate, it feels like something inside the phone is in it's death throes, coughing and spluttering - the stutter is jarring! But if I use my wife's OnePlus 6 (which has a fixed 60Hz screen), it doesn't feel so bad. It's definitely not as smooth as 120Hz but the 60Hz on a 60Hz panel feels smoother than 60Hz on a 120Hz panel. Is it only me or has anyone else had a similar experience?
I have the same issue as well..so pissed..using latest BUKG
I'm on Android 11, One UI 3 still, and when my phone displays split screen apps the refresh rate drops from 120 down to 60.
This must be some battery saving feature, because If I toggle performance mode (processing speed) from the drop down quick menu, the fps shoots back up to 120 in split screen.
So an easy fix if you need 120 in split screen.
Gasman said:
I'm on Android 11, One UI 3 still, and when my phone displays split screen apps the refresh rate drops from 120 down to 60.
This must be some battery saving feature, because If I toggle performance mode (processing speed) from the drop down quick menu, the fps shoots back up to 120 in split screen.
So an easy fix if you need 120 in split screen.
Click to expand...
Click to collapse
Yes, that seems to "fix" it for split screen. However, it doesn't resolve picture in picture fps drop to 60Hz.
Hmm must be an Android 12 thing. I'm sat here typing this with YouTube playing pip and the screen is holding 120fps even with my finger removed from the screen.
I did try Android 12 when the public version was released, but didn't like it, so downgraded back to the last version of 11, with a clean wipe.
Ok something odd going off, my screen seems to be stuck at 120!
Forcing it back to 60 in display options, works. Putting it back to adaptive, keeps the screen at 120. Even on the lock screen, and AOD!
I might try a reboot.
Gasman said:
Ok something odd going off, my screen seems to be stuck at 120!
Forcing it back to 60 in display options, works. Putting it back to adaptive, keeps the screen at 120. Even on the lock screen, and AOD!
I might try a reboot.
Click to expand...
Click to collapse
If you're in low ambient light, screen at low brightness, panel will be locked at 120Hz even with adaptive selected. Move to bright area or increase screen brightness and check if you are able to get to 60Hz
Gasman said:
Hmm must be an Android 12 thing. I'm sat here typing this with YouTube playing pip and the screen is holding 120fps even with my finger removed from the screen.
I did try Android 12 when the public version was released, but didn't like it, so downgraded back to the last version of 11, with a clean wipe.
Click to expand...
Click to collapse
Yes, I've only noticed this issue since Android 12 with the picture-in-picture scenario. Hopefully Samsung fixes this soon.
Gasman said:
Ok something odd going off, my screen seems to be stuck at 120!
Forcing it back to 60 in display options, works. Putting it back to adaptive, keeps the screen at 120. Even on the lock screen, and AOD!
I might try a reboot.
Click to expand...
Click to collapse
Nothing odd there - as previous poster mentioned, it's always behaved that way when the ambient lighting is low enough. And yes, has always been that way for AOD too. I never understood why 120Hz is required particularly for that!
I think that after android 12, my unlock animation is rendered at 60hz because it is sometimes sluggish. Did a full factory reset and i have the last update. Do you guys experience the same? other than that the phone is perfectly smooth
Still the same issue with BULC December update. Somewhat disappointing, as you'd think this should be quite an easy fix.
Still same issue after BULG update with PIP. As a previous person has noted, split-screen mode appears to be auto-throttled to 60Hz by default, and the only way to change this so it remains at 120Hz is by toggling "High" or "Maximum" "Processing speed".

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