Display panel defects - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

Having the phone for over 3 weeks now and I've noticed in very low brightness (1-10%) that display is unevenly lit. Dark gradient on the right side. Visible especially if your view a dark grey solid colour.
Is this an OLED issue or do I have a defective panel?

Va2c said:
Having the phone for over 3 weeks now and I've noticed in very low brightness (1-10%) that display is unevenly lit. Dark gradient on the right side. Visible especially if your view a dark grey solid colour.
Is this an OLED issue or do I have a defective panel?
Click to expand...
Click to collapse
This is something related to DC dimming feature. Try disabling DC Dimming option in Display setting and check if you notice any difference.

I experience the exact same issue... on my Pixel 3a XL.
Came here because I'm evaluating a new purchase, and the first post I read is about this problem.
Meh!

P12AV33N said:
This is something related to DC dimming feature. Try disabling DC Dimming option in Display setting and check if you notice any difference.
Click to expand...
Click to collapse
I've tried that before posting here and it's still there. It's apparent when you use at night. Day time practically imperceptible.

Giocarro said:
I experience the exact same issue... on my Pixel 3a XL.
Came here because I'm evaluating a new purchase, and the first post I read is about this problem.
Meh!
Click to expand...
Click to collapse
I think since these are budget devices (relatively) with amoled screens they cut corners in QCC.

Va2c said:
I've tried that before posting here and it's still there. It's apparent when you use at night. Day time practically imperceptible.
Click to expand...
Click to collapse
Strange!
I only experience the exact same problem but only when the DC dimming is on, otherwise everything is fine even on the lowest brightness. (except ofcourse the smearing issue when scrolling through dark background on low brightness)

P12AV33N said:
Strange!
I only experience the exact same problem but only when the DC dimming is on, otherwise everything is fine even on the lowest brightness. (except ofcourse the smearing issue when scrolling through dark background on low brightness)
Click to expand...
Click to collapse
That's an issue with all amoled screens

Same here, I dont know if i should keep the phone, i like it a lot but this issue has left me dissapointed, i've bought two of them and both have the same problem

oliese said:
Same here, I dont know if i should keep the phone, i like it a lot but this issue has left me dissapointed, i've bought two of them and both have the same problem
Click to expand...
Click to collapse
If it's any consolation then even the one plus 7 (just checked my friend's) has the same issue. The notch also affects screen around it.

I have this on my 9TP. Only visable at very low brightness in a dark room and grey background.
Looks like a piece of tape what's folded up. Poor QC but it doesn't bother me.
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Verstuurd vanaf mijn Redmi K20 Pro met Tapatalk

https://www.xda-developers.com/redmi-k20-pro-xiaomi-mi-9t-pro-review-flagship/
As mentioned in the article, it's normal. Hope this settles everything.

compared my K20 with another
Tested my Redmi K20 with another K20 and found that only my device has uneven brightness on left side of panel. Red many threads that its common flaw among AMOLEDS but there isn't any stat what % of AMOLEDS. Moreover didn't find any clue why this happen in first place.
My device shows visible uneven grey at 10~15 % brightness.

Related

LCD display

I broke my digitizer and LCD display and bought the replacements via ebay. Both were "OEM" or whatever.
I replaced them, and the digitizer seems to have worse multitouch than before. I understand that it sucks, but my 2 points never used to get confused when they crossed axis, (or so I dont remember them getting confused).
But also, my LCD seems to have a pink hue to it. I definitely know mine did not have this before the break. I read over a lot of posts here and elsewhere about the pink hue problem. This doesn't appear to be a browser problem, but an actual hardware issue.
Should I return the LCD and get a replacement and hope that the other one I get will be regular, or are my odds slim to none. My previous one was NOT pink whatsoever. And this new one I noticed it right off the bat.
N1 screen isnt LCD... did you get an LCD or an AMOLED?
Well it's LCD with LED backlight. I believe the company I got it from off Ebay got the OEM product directly from Samsung.
It is the same as the one I had before. The part number on the display is the same as the one on my original cracked one, 60h00287-00p
stuff said:
Well it's LCD with LED backlight. I believe the company I got it from off Ebay got the OEM product directly from Samsung.
Click to expand...
Click to collapse
So the colours are a lot more bland and the black isn't really black? You would most definitely know if you got an LCD, it would look ugly compared to what you had.
stuff said:
Well it's LCD with LED backlight. I believe the company I got it from off Ebay got the OEM product directly from Samsung.
Click to expand...
Click to collapse
Are you SURE its an LCD? as andrew said, the nexus only has an AMOLED screen which is a completely different technology
if it is indeed an amoled, then you may have gotten an ATT nexus amoled which is known to have a purple/pink hue
Well what I'm saying is the p/n written on both displays are the same, both from samsung. Which means, yes, it is a AMOLED display.
I don't think it's a case of an "at&t" display being sent to me. My nexus one was for at&t, and I didn't have such pink issue. But this new display does.
stuff said:
Well what I'm saying is the p/n written on both displays are the same, both from samsung. Which means, yes, it is a AMOLED display.
I don't think it's a case of an "at&t" display being sent to me. My nexus one was for at&t, and I didn't have such pink issue. But this new display does.
Click to expand...
Click to collapse
well china sells a lot of fakes and they can match up stuff like that.....
and not all nexus display this kind of saturation. Do you have a picture so we can see the extent of the hue?
it doesn't show up much in pics.
but I think it's beginning to fade. I've been leaving the display up with a red color. and alternating through white and black.
Here's a pic I took. But again, it doesn't show up much in it.
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nah its noticeable on the keyboard and borders. use if for a while and see if the screen conditions itself. that is the same hue i believe that some att users were mentioning
It's worse to the eye than in the photo though.
I'll see if it fixes itself.
hopefully it just needs to be broken in
At 100% brightness, the pink tink is barely noticeable.
Actually, anything above 50% brightness and it seems fine. It's when it gets lower than that, it starts to look pink

[HELP] Display issue in the bright sun

Guys today i was outdoor.....i was using the phone in bright sunlight i could see some vertical dotted line(single line) which moves horizontally when i tilt the phone.......i'm wondering whether it is a display issue or because of the screen protector...............at indoor it is normal i dont see any kind of lines.......only when bright sunlight directly falls on it i am experiencing the issue.........please Comment thanks
mysterio619 said:
Guys today i was outdoor.....i was using the phone in bright sunlight i could see some vertical dotted line(single line) which moves horizontally when i tilt the phone.......i'm wondering whether it is a display issue or because of the screen protector...............at indoor it is normal i dont see any kind of lines.......only when bright sunlight directly falls on it i am experiencing the issue.........please Comment thanks
Click to expand...
Click to collapse
Its normal.. All xz has this and im guessing its not the layer that sony has installed and i have removed mine..
nazrin313 said:
Its normal.. All xz has this and im guessing its not the layer that sony has installed and i have removed mine..
Click to expand...
Click to collapse
can anyone confirm this
mysterio619 said:
can anyone confirm this
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Click to collapse
Yes it's normal.
Sent from my C6602 using xda premium
mysterio619 said:
Guys today i was outdoor.....i was using the phone in bright sunlight i could see some vertical dotted line(single line) which moves horizontally when i tilt the phone.......i'm wondering whether it is a display issue or because of the screen protector...............at indoor it is normal i dont see any kind of lines.......only when bright sunlight directly falls on it i am experiencing the issue.........please Comment thanks
Click to expand...
Click to collapse
i think its the sensors
the horizontal lines are the Driving lines and the vertical is the sensing lines
Thanks guys bit of a relief now
mysterio619 said:
Guys today i was outdoor.....i was using the phone in bright sunlight i could see some vertical dotted line(single line) which moves horizontally when i tilt the phone.......i'm wondering whether it is a display issue or because of the screen protector...............at indoor it is normal i dont see any kind of lines.......only when bright sunlight directly falls on it i am experiencing the issue.........please Comment thanks
Click to expand...
Click to collapse
if put extra protector on pre-installed one from sony that might be because of that.
if not i should say i didn see anything like this on any phones! (my experience)
and cause it has high density of pixel i must not have any effect or react on straight sun-light !!!
can u send pic ?
x102x96x said:
if put extra protector on pre-installed one from sony that might be because of that.
if not i should say i didn see anything like this on any phones! (my experience)
and cause it has high density of pixel i must not have any effect or react on straight sun-light !!!
can u send pic ?
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Click to collapse
yes i have applied a screen protector which came with sony box
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If u mean those colorful dots
SO it s not normal ask sony for replacement.
However u must not have any effect and reflect and ... on screen with high density of pixel.
It is completely normal, it's part of the touchscreen digitizer. It's visible on almost all phones under strong light. I could see it on my S, Arc (S) and Neo too.
Sent from my C6603 using xda premium
LOL!!! Indeed it's the touch censor, that's how capacitive screens works! Don't freak out, every Xperia has it!

[Q] black and white lines in camera

Hi guys...
i have a problem with camera,
when i try to snap photos with white back ground, am able to see moving black and white lines.
the same lines are observed on photos also.
the service centre people have replaced my mother board, but still same problem :crying:
Again my friend adviced, it can be due to some light effects, but taking a snap at same place with other mobile is fine
please advice me guys if anyone have faced this problem.. :highfive:
find the attached photos
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Depends on the lighting so not much can be done.
I've had the problem with my X once. It was in Hershey Park Arena (the old one) in one of the halls, taking a picture of a logo on a wall.
I've never seen it since. So it may be related to specific lighting conditions.
What happens at home, under low non-florescent lights?
KidJoe said:
I've had the problem with my X once. It was in Hershey Park Arena (the old one) in one of the halls, taking a picture of a logo on a wall.
I've never seen it since. So it may be related to specific lighting conditions.
What happens at home, under low non-florescent lights?
Click to expand...
Click to collapse
Under non fluorscent lights, it is fine.
why i am worried is, i am using this phone from 5 months, and recently this change is observed and
at the same place , with the same model (moto x) doesnt show this lines/this behaviour.
so i thought this is problem my handset itslef.
Here is mine -> http://forum.xda-developers.com/showpost.php?p=50969034&postcount=289
KidJoe said:
Here is mine -> http://forum.xda-developers.com/showpost.php?p=50969034&postcount=289
Click to expand...
Click to collapse
so did you found any solution, am very depressed with this behaviour because am a lover of camera, :crying: i would love to capture a lot.
but now under lights, i cannot take a good one.
nagendra.badam said:
so did you found any solution, am very depressed with this behaviour because am a lover of camera, :crying: i would love to capture a lot.
but now under lights, i cannot take a good one.
Click to expand...
Click to collapse
That was the only time I ever saw it. I haven't seen it since.
nagendra.badam said:
so did you found any solution, am very depressed with this behaviour because am a lover of camera, :crying: i would love to capture a lot.
but now under lights, i cannot take a good one.
Click to expand...
Click to collapse
from what you are describing it sounds like the issue only arises in just the right conditions. that means your camera hardware is probably fine and the problem can be seen as software related. Moto X camera software doesn't give you much in the way of settings to mess around with, so you should try third party apps that do have more settings. Maybe a more photography enthusiastic user can chime in here, but I'd think trying an app that has settings for different lighting conditions, stuff like white balance, etc might help.
I use stock camera myself, and not that much at that, but I do notice you can get completely different exposure of the same scene in the same lighting if you change something like the manual focus or the angle of your shot.
I have a Moto X and was facing a similar problem. Using a third-party camera app named CameraMx solved it for me! I dont know why or how but it worked for me! That app seems to correct those black and white lines in some way! Hope it works for u too!

screen comparison between 128gb and 64gb, not the same?

I recently got my 128gb, and returning the 64gb tomorrow, did some comparison on the screen, 128 on the left side.
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Light bleeding on the camera at low light condition
Brighter on the 128gb(letft). Stripes are from the camera(glare)
Different display modes?
Takes a few hundred hours for the pixels to settle. In a month they both would probably look similar.
556AR said:
Different display modes?
Click to expand...
Click to collapse
This. Make sure your display mode is set to the same setting on both devices.
Light bleed does suck though. I had that on pretty much every HTC device I've owned.
556AR said:
Different display modes?
Click to expand...
Click to collapse
Same "Basic" display modes (as posted on the pic).
jhun80 said:
Same "Basic" display modes (as posted on the pic).
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Click to collapse
While this may sound crazy! This is normal (that there not exactly the same). While you might be able to keep comparing different S6 until you find a pair that "matches", or have the same screen brightness any random pick won't be the same...there are many factors and as simple as different build dates etc...
On the S6 now and have had every galaxy since the first one and several HTC's before. I always by in pairs (keep the wife upgraded) and have noticed this every single time and not just with the Samsung's. Just how it is.
Sent from my SM-G920T
Alright, thanks
This is 'normal'. I am on my 3rd S6 because the first two had that ugly pink tint to it. My 3rd phone not only has no pink tint, but also a really crisp white display. Compared to the previous phones, they were much more yellow.
geoldr said:
This is 'normal'. I am on my 3rd S6 because the first two had that ugly pink tint to it. My 3rd phone not only has no pink tint, but also a really crisp white display. Compared to the previous phones, they were much more yellow.
Click to expand...
Click to collapse
I'm on my 3rd as well, no pink but it does have some green at the bottom sadly. It's not too noticeable, and I don't think I want to go through the hassle of getting a 4th replacement. There's a whole thread on it here: http://forum.xda-developers.com/galaxy-s6/general/getting-replacement-s6-due-to-screen-t3074865
All the AMOLED displays for the S6 are going to have slightly different factory calibration on all profiles. So no two S6 displays are going to be the exact same.
There is no such thing as light bleed on AMOLED screens.
@rbiter said:
There is no such thing as light bleed on AMOLED screens.
Click to expand...
Click to collapse
Exactly. Basic knowledge
AMOLED does not have a backlight, it lights up each individual pixel which is why you can have inky blacks, because it simply turns off those pixels, unlike LED screens that use a black image with a light behind it giving off a grayish background.
@rbiter said:
There is no such thing as light bleed on AMOLED screens.
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Click to collapse
So how do you call that on the picture i posted? That only happens when i opened my camera app on total darkness. A little bit brighter on the botttom
jhun80 said:
So how do you call that on the picture i posted? That only happens when i opened my camera app on total darkness. A little bit brighter on the botttom
Click to expand...
Click to collapse
light sensor is different in the camera (more sensitive or uneven)
I noticed a change in my screen after installing a tmobile update. Originally there was a completely black screen on the lockscreen, but after the update it almost appeared that there was a sort of gradient almost representing a light bleed.

Uneven brightness/washout on display

I'm not really sure what to call this, because I've never seen it on an OLED screen before.
I have the T813 WiFi model.
Recently, I've noticed, when using sites or apps with a dark background (like XDA Labs), that my display's brightness is noticeably uneven. Holding it in landscape mode, with the home button on the right, the screen looks something like this:
Bottom left corner: normal, full dark colors
Top left and bottom right: coloring is alright, but not as good as the bottom left
Middle (vertically): noticeably brighter, sort of a strip of washed out color
Top right corner: the worst area, looks like the pixels were burned
Excluding the strip in the middle, this is a pretty even radial gradient from the bottom left.
I can't really take a picture of this, because it just won't show up. I just have to do my best to describe it. It's almost like the backlight is messed up, except that OLED doesn't use a backlight. The pixels toward the top right are just a lot brighter than the ones on the bottom left, so they look whiter or washed out. It's somewhat strange. I've seen a few burn tests of SAMOLED screens (so Samsung) and noticed they turn white when heated and tend not to restore. I do put this in a computer bag, but I don't know what could be in here that would cause enough heat near one corner to do this (the CPU is top left, which is alright in color).
Has anyone seen this before? Should I get a warranty replacement? Do I need to describe it better?
if it bother you that much, just do warranty replacement.
my friend did it for his T715, the new unit look slightly better
but of course still no 100% uniformity.
Here's how mine somewhat looks (intentionally raised brightness to better show the effect. My power button also seems to stick a bit sometimes.
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Sent from my iPhone using Tapatalk
Devhux said:
Here's how mine somewhat looks (intentionally raised brightness to better show the effect. My power button also seems to stick a bit sometimes.
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Click to collapse
That's exactly what it looks like.
Zacharee1 said:
That's exactly what it looks like.
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Click to collapse
Yeah. After further testing there's definitely something I don't like.
Using the Display Tester app in the Play Store, I set the 4-gradient test to use the same dark grey color across the screen (1A 18 1A). Results weren't pretty......
Sent from my iPhone using Tapatalk
Devhux said:
Yeah. After further testing there's definitely something I don't like.
Using the Display Tester app in the Play Store, I set the 4-gradient test to use the same dark grey color across the screen (1A 18 1A). Results weren't pretty......
Click to expand...
Click to collapse
Hmm. I'm kind of glad to see it's probably not a defect, but also kind of annoyed that it's normal. It'd be great if someone else could say if they have the problem too.
I have something like this to. Its annoying but only really visible with greys. Its relatively common with AMOLED screens, my S6 edge+ has it as well, but only very faintly.

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