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Screen flickering at high brightness

Hi All,
I've just bought a 256GB Mix. loving it but i've noticed a distracting flickering when the screen is at higher brightness settings. It's hard to describe almost like random dips occur in the brightness.
Obviously auto brightness is off and i've disabled as much battery saving things as i can find.
It persists through different ROMS, tried various MIUI roms, RR, and AICP.
Do i have a dud? Any Firmware updates i can try?

Are you on the newest firmware I believe its 7.12.21
Sent from my MI MIX using Tapatalk

BigM69 said:
Are you on the newest firmware I believe its 7.12.21
Sent from my MI MIX using Tapatalk
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Unsure how to check? Currently rocking MIUI9 Globe Rom.

paulrgod said:
Unsure how to check? Currently rocking MIUI9 Globe Rom.
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I'm not sure how to check either. Sorry man wish I could help you. I'm sure there are ways of checking though.
Sent from my MI MIX using Tapatalk

Have you found the solution? I bought one recently and noticed it too

phuctran51 said:
Have you found the solution? I bought one recently and noticed it too
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Nope, I never did find a solution. I just have the brightness around 90%, it doesn't seem to do it around that. It's plenty bright at that so I'm happy. Considered sending it for RMA but couldn't be bothered with it being a Chinese seller, just thought it would be too stressful..
I'm considering upgrading to a Mix 2s soon anyway..

I have a similar problem on Xiaomi 4A, it looks like this video (iphone right): Youtu.be/Q6CANkiPkUM
Do you have a similar flicker?

Replacement screen for what 80 bucks

Perhaps the problem is not in the screen, but in the power supply pwm - inductor, capacitor

Hello I've redmi note 5 pro i also have same issue past few months but i didn't get any solution. when my phone brightness will high then screen flickering too fast and this issue is too much trouble. So please any one have any solution please let me know.

OLED display strange bright bands on dark screen

Hi all!
I was using my P20 Pro in total darkness, visualizing a black picture with max brightness. I noticed these strange bright bars in the upper and in the lower part of the display, and I tried to take a picture of them.
However they are extremely dim and can be noticed just with the corner of the eye; to let them appear in the pictures I had to use a reflex with an exposure time of 30 sec and very high ISO.
In the photos, individual bright pixels seem to be present, which should not be since the display is OLED.
I found nothing on the internet about this; if you have a reflex give it a try (just make sure to be in a totally dark room), I would like to now if it's some kind of problem of my P20 or it's a lack in the designing.
Picture 1
Picture 2
Picture 3

If it's a problem I have the same, also on the suggest apps screen there's a red semi circle on the left just above the keyboard
Sent from my CLT-L09 using Tapatalk

There is allready another thread about this on the p20 pro here. Just search before opening a new one maybe. You can also do a Google search about "old" and "uniformity". Have fun with this (I returned my 1st sample of p20 pro for this, too bad, the new one is better but not perfect)
Envoyé de mon CLT-L29 en utilisant Tapatalk

xfer48 said:
There is allready another thread about this on the p20 pro here. Just search before opening a new one maybe. You can also do a Google search about "old" and "uniformity". Have fun with this (I returned my 1st sample of p20 pro for this, too bad, the new one is better but not perfect)
Envoyé de mon CLT-L29 en utilisant Tapatalk
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Thanks, could you please link that thread?
I searched before opening this one but I couldn't find anything

Here https://forum.xda-developers.com/huawei-p20-pro/help/screen-issue-t3777192

xfer48 said:
Here https://forum.xda-developers.com/huawei-p20-pro/help/screen-issue-t3777192
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Uhm, maybe it's related with the problem of uniformity but it's a bit different.
If someone is able to try the test please let me know

Sermazz said:
Uhm, maybe it's related with the problem of uniformity but it's a bit different.
If someone is able to try the test please let me know
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Looks indeed as a different issue. The linked thread is about some sort of clouding which is often present with amoled, but yours looks different.
I would ask for a replacement if i was you!

I have this exact same issue on my new P20 Pro. Visible in the OLED Tools app uniformity test, whenever brightness is set at 4 and 5 especially with the grey and green backgrounds. Haven't noticed it during normal usage... yet.
Can anybody else confirm this? Or thread starter, what did you end up doing? Exchange the phone?

touchyandalou said:
I have this exact same issue on my new P20 Pro. Visible in the OLED Tools app uniformity test, whenever brightness is set at 4 and 5 especially with the grey and green backgrounds. Haven't noticed it during normal usage... yet.
Can anybody else confirm this? Or thread starter, what did you end up doing? Exchange the phone?
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I contacted Huawei sending the pictures of the issue. They confirmed it's an hardware problem and told me to go to the nearest repair centre or to send my phone in warranty with their courier service.
However, I ended up doing anything since the problem is not evident during daily use, and I can't do without my phone. My worry is that this problem could lead to a much shorter life of the OLED display, that's why I advise whoever is able to, to send the phone to Huawei because you will have your phone repaired or replaced.

Banding / Uniformity
I am also having the same issue with my P20 Pro. A green band at the top and bottom the dark situations and problems with green/grey uniformity. Have you been able to replace your screen or phone?
I dont know if I would have my screen replaced or phone. Lets see.

how did this started after all?

P4XL - Low brightness + Forced 90hz = Severe crushed blacks and purple hue

UPDATE: Found a fix and hope it works for you guys too!
Forced 90hz is the way to go! Pixel 4 FTW!
1. Forced 90hz - ON
2. Ambient eq - ON/OFF (I have it ON but I heard some people turned it OFF and it fixed the black crush/purple hue. I tried it and it didn't fix anything for me
3. Always on display - MUST BE ON (I had this OFF before to save battery. This must be turned back on. I can replicate this every time, turn it off and the crushed black/purple hue appear, turn it on and the problem goes away.
Enjoy your P4 on 90hz always guys!
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I had my P4XL on forced 90hz the whole day. When night came my brightness was at around 30% and I noticed something was wrong with the screen. The default grey wallpaper was severely crushed, it looked more black than grey; youtube videos looked awful in darker scenes; my astro shots looked off, there was no transition in the night sky, it went from brighter areas to sudden pitch black.
I took out my P3XL to compare and it was significantly better! I knew this couldn't be right so I thought maybe I should try turning off the forced 90hz on my P4XL. Once it was off, the black crush was gone!
Is this meant to happen? Does higher refresh rates relate to brightness or has Google done something with it?
Here is a link to photos I took - P3XL VS P4XL forced 90hz (ON) & P3XL VS P4XL forced 90hz (OFF)
ttps://imgur.com/a/mS7yZ5o (i'm a junior member and can't post links, please add 'h' to the front)

I tried to replicate the problem on my pixel 4 xl and didn't have the same issue

I have this exact same issue and it has to do with the refresh rate being forced to 90hz as you said. My guess is if they are Samsung panels this would be their first 90hz panel and the P4 very well could be the guinea pig to see if they can create a solid 90hz panel? Then sadly they failed to deliver a solid product and it was already too late into production and all the panels have been made. Google then was aware of the issue with the panels and locked the higher refresh rate to the brightness levels. Google probably expected that the masses wouldn't dive into developer settings and force 90hz on. They probably also didn't expect many people to complain about 90hz barely kicking in unless you were running at a higher brightness % either. So I'm guessing their software update will lower the required brightness to trigger 90hz with Smooth Display activated and possibly increase the overall brightness of the display. The display is locked around 4xx nits while it's confirmed with auto brightness off that it can achieve over 600 + when playing HDR content. So it's probably just a first batch woes for Samsung and we got stuck with it unfortunately.

zetsumeikuro said:
I have this exact same issue and it has to do with the refresh rate being forced to 90hz as you said. My guess is if they are Samsung panels this would be their first 90hz panel and the P4 very well could be the guinea pig to see if they can create a solid 90hz panel? Then sadly they failed to deliver a solid product and it was already too late into production and all the panels have been made. Google then was aware of the issue with the panels and locked the higher refresh rate to the brightness levels. Google probably expected that the masses wouldn't dive into developer settings and force 90hz on. They probably also didn't expect many people to complain about 90hz barely kicking in unless you were running at a higher brightness % either. So I'm guessing their software update will lower the required brightness to trigger 90hz with Smooth Display activated and possibly increase the overall brightness of the display. The display is locked around 4xx nits while it's confirmed with auto brightness off that it can achieve over 600 + when playing HDR content. So it's probably just a first batch woes for Samsung and we got stuck with it unfortunately.
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I read somewhere that LG made the screens for the phones.

cpatrick08 said:
I read somewhere that LG made the screens for the phones.
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I really hope not

cpatrick08 said:
I read somewhere that LG made the screens for the phones.
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The teardown from iFixit indicates that Samsung has manufactured the displays.

I noticed the same issue. White 4xl, I forced the 90hz and sometimes when I unlocked the phone at night low brightness the screen looks watched out, blacks look gray but then I locked the phone and open it again and I get the issue op is talking about. Very crushed blacks and colors are way off. I also have on the night light as well. I will test more today.

zetsumeikuro said:
The teardown from iFixit indicates that Samsung has manufactured the displays.
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Ok

cpatrick08 said:
I read somewhere that LG made the screens for the phones.
Click to expand...
Click to collapse
It was about the smaller Pixel 4:
https://www.droid-life.com/2019/10/24/pixel-4-lg-display/

zetsumeikuro said:
I have this exact same issue and it has to do with the refresh rate being forced to 90hz as you said. My guess is if they are Samsung panels this would be their first 90hz panel and the P4 very well could be the guinea pig to see if they can create a solid 90hz panel? Then sadly they failed to deliver a solid product and it was already too late into production and all the panels have been made.
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Didn't Samsung make the panels for the 90h display for OnePlus 7 Pro? If so, they've been out for about six months and they are excellent panels!

rajeshr said:
Didn't Samsung make the panels for the 90h display for OnePlus 7 Pro? If so, they've been out for about six months and they are excellent panels!
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That was my thoughts, and yes they are Samsung ones. Barely any complaints about the OnePlus 7 pro. Flooding in for the pixel 4 already

Some people in reddit have had success turning off Always On Display, yes, not Ambient Display but AOD.
It makes no sense but it worked for them.

m+a+r+k said:
Some people in reddit have had success turning off Always On Display, yes, not Ambient Display but AOD.
It makes no sense but it worked for them.
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If you have forced 90hz you actually want to have AOD on and that will get rid of the purple/green tint for certain colors at lower brightness.

Weird banding on photos

I've noticed banding on bright photos this evening. The bizarre thing is that it affects both 48MP and normal photos; so two different cameras. Both in the Xiaomi camera app and other apps. I think it may just be the fact that I'm pointing it at a TV... but what was alarming is that the banding was essentially like an overlay; not moving as I panned the phone.
Is this hardware related or software related or normal?

Those lines are Very normal, when capturing screens.
Sent from my Redmi K20 Pro using Tapatalk

droident said:
Is this hardware related or software related or normal?
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Normal. It's TV screen display limitations.

droident said:
I've noticed banding on bright photos this evening. The bizarre thing is that it affects both 48MP and normal photos; so two different cameras. Both in the Xiaomi camera app and other apps. I think it may just be the fact that I'm pointing it at a TV... but what was alarming is that the banding was essentially like an overlay; not moving as I panned the phone.
Is this hardware related or software related or normal?
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Click to collapse
Same on my 9T Pro. I have a 5 years old Galaxy Note 5 and I compared them same time with the same objects and while nothing is seen in Note 5, Xiaomi suffered. But if you're using default miui cam, switching antibanding to auto helps a bit.

tunado said:
Same on my 9T Pro. I have a 5 years old Galaxy Note 5 and I compared them same time with the same objects and while nothing is seen in Note 5, Xiaomi suffered. But if you're using default miui cam, switching antibanding to auto helps a bit.
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What threw me was that the banding acted like the origin was the sensor. Seemingly, it didn't move with panning the device. Weirder still is that pointing the sensor away from the TV still elicited some minor banding; almost vertical portions of the sensor had gone screwy.
Since I couldn't reproduce it once I'd gone into another room nor on another bright white LED screen I deduced that it must be the flat-screen in question - it's a plasma screen. And for whatever reason, whilst the banding looks normal in a still, the behavior was odd enough to give me the heebies that something was seriously wrong with the phone's cameras. I'm gonna take a wild guess and say plasma screens and camera sensors don't mix well. I generally find plasma panels a little flickery to the naked eye to begin with.
The fact that both camera modules behaved identically gives me some peace of mind. Didn't have much luck with the antibanding. I think the plasma refresh is just that implicative.

Question Green tint ? Lolz

Just wondering if the green tint issue synonymous on Samsung 2020 panels has continued its trend onto the S21U? Asking for a mate.

Limeybastard said:
Just wondering if the green tint issue synonymous on Samsung 2020 panels has continued its trend onto the S21U? Asking for a mate.
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Hi.
Haven't noticed any green tinting on my panel yet. Even on the lowest brightness. There is a teeny tiny smidge of motion smearing at the minimum brigntness when scrolling dark web-pages, but that's about the only fault I can find with the screen so far.

enigmaamit said:
Hi.
Haven't noticed any green tinting on my panel yet. Even on the lowest brightness. There is a teeny tiny smidge of motion smearing at the minimum brigntness when scrolling dark web-pages, but that's about the only fault I can find with the screen so far.
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That’s good to know. Thanks.

Limeybastard said:
Just wondering if the green tint issue synonymous on Samsung 2020 panels has continued its trend onto the S21U? Asking for a mate.
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I had the S20 (6 different devices). All had a green/red tint issue. The S21 Ultra has a much better display. Mine at least.

iamnotkurtcobain said:
I had the S20 (6 different devices). All had a green/red tint issue. The S21 Ultra has a much better display. Mine at least.
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Yeah. One of my Note 20 Ultras was more green tintish than the other. I couldn’t stand it, the Oneplus 8 pro also had it slightly. As did the iPhone 12 Pro Max. Thanks for sharing your experience.

adamlee2012 said:
You can change the colour temperature anyway under display settings. If you get a display with green tint just turn down the green and up the red.
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Cheers. It didn’t quite work that way in practice.

I had the screen show a like a green background for split second , does this mean the screen is starting to get faulty or is it a software issue? I had this phone since launch (for about 4 months now)

oae08 said:
I had the screen show a like a green background for split second , does this mean the screen is starting to get faulty or is it a software issue? I had this phone since launch (for about 4 months now)
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If it was a one-time occurence, it could be due to anything. Difficult to diagnose it based on a split-second incidence. If it doesn't happen again, don't worry about it. But if the same issue keeps occuring, then it may be worthwhile investigating.

enigmaamit said:
If it was a one-time occurence, it could be due to anything. Difficult to diagnose it based on a split-second incidence. If it doesn't happen again, don't worry about it. But if the same issue keeps occuring, then it may be worthwhile investigating.
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Its a one-time thing for now, but it got me scared. especially since I am currently having another issue with the phone (its crashing and rebooting randomly).

oae08 said:
Its a one-time thing for now, but it got me scared. especially since I am currently having another issue with the phone (its crashing and rebooting randomly).
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I saw your post in the other thread. This wouldn't have been a cause of concern in isloation but if you add your reports of system crashes and erratic behaviour, there may be something serious wrong with your phone under the surface. Would'nt be the first time this has happened to someone (at least not me).
This is exactly the kind of situation warranty is for.
I cannot profess to know what you should do next but i can only tell you what I would do faced with your situation. And that is to head to the nearest service centre and explain the issue and ask for a resolution. If that fails, escalate it upwards.

Looks like I jinxed myself by creating this post before receiving my device. Since I got it yesterday it has a very aggressive green to pink tint when slightly tilting the viewing the angel. I sent it back. The lord taketh away green tint and replaced it with this LOLzzz.