Develop Bugs

[Q] Yellow tint when looking straight at the phone

Hi there,
I just got my T-Mobile SGS2. When I look straight at the phone screen, I see whites that are yellowish, as if the color temperature is bumped up by +2000-3000K. Tilting the phone 5-10 degrees to the left or right shows proper, much colder whites, as one would expect. The same nice whites can be seen if I tilt 20-30 degrees up/down.
Perhaps I would not have noticed this problem had I not played the with international version of SGS2 - the whites on that phone are just stunning anyway you look at it. I went back to the T-Mobile store and all the SGS2 phones there the same "issue". The guy in the store thinks that is how the colors should be...
Am I going crazy here? Is it normal to see this yellow cast with a straight viewing angle? Can someone confirm that their screen shows fine whites at any viewing angle? I'm considering sending the phone back for replacement, but it'd be futile if this slight yellow cast is indeed normal...

Mine is like that too. I think its just a quality of the amoled screen, cause I've seen it on other amoled phones too. You get used to it.
Sent from my SGH-T989 using xda premium

I've checked out/toyed around with close to half a dozen handsets since they came out a couple weeks back and I have yet to see one that has a yellow tint. Every one I've seen has had a blue hue/tint, some approaching a grey cast while a couple others almost like a light mint green. Unfortunately AMOLED screens have the hardest time reproducing white as there apparently is no such thing as a true white LED.
Sounds like the one you got did indeed come a lot warmer than most which tend to me on the cooler side. I wish they would have a factory setting much like most flat panel TVs have for setting/adjusting color temperature to your liking. The blue tint really bugs me but I guess over time you just get used to it. Same would go with yellow too, just have to get used to it. I suppose you could keep exchanging phones as some lucky few out there seem to have gotten handsets with a good color temperature where whites actually look white, but who knows how many times you'd have to try that. I'd bet most places wouldn't be too willing to do that for a customer though.

I'm looking at a yellowish tinted XDA now. Totally dark in my room, auto backlight could be the issue...
Sent from my Herc + EagleBlood V1

Screen problem: Is this affect of Pentile Matrix or not.

Hallo friends, i read lot of about problem with this kind of display( pentile matrix)
I have vertical and horizontal banding too. But this one is something what is bothering me much more.
http://imageshack.us/photo/my-images/208/imgp5137v.jpg/
http://imageshack.us/photo/my-images/809/imgp5134.jpg/

Delarock said:
Hallo friends, i read lot of about problem with this kind of display( pentile matrix)
I have vertical and horizontal banding too. But this one is something what is bothering me much more.
http://imageshack.us/photo/my-images/208/imgp5137v.jpg/
http://imageshack.us/photo/my-images/809/imgp5134.jpg/
Click to expand...
Click to collapse
That's nothing to do with the Pentile Matrix! Definitely a defective screen, return it to the store and ask for a warranty replacement. The 'banding' is more to do with the AMOLED screen technology rather than the Pentile, as it was present on my SGS2, but is generally only visible under certain conditions (background colour/brightness).
Regards.

Is it visible on colors other than grey?

Sure, on blue background too,sometimes on white.(poarws photo with blue background) It depends on brightness.
More visible at white background with high brightnes.
More visible at blue and grey background with lower brightnes.

It does have to do with the Amoled technology, but I doubt it's a defective display. You can try to exchange it to see if it really is defective or not.

I have some vertical and horizontal banding only with lowest brightness at the white background.
With maximum brightness no lines or whatever

AMOLED has a few imperfections here and there, so it's not surprising. But if it's bothering you too much exchange it for another one, it could have less prevalent issues.

Just performed a test using screen test app my screen looks great.
Sent from my Galaxy Nexus using XDA App

How high is brightness with test screen
Mine is fine too but 60 percent and more.But this one issue bother me pernament ( no matter if 30 or 70 percent brightnes)
Tuesday iam going for a new piece, hope that will not be affected worse than mine

Try viewing those shades of grey on your phones, it's usually the most problematic color. Use a low brightness setting (around 25%) at a dim environment.

This exists on all OLED screens. Its the exact same on my Nexus S. It has nothing to do with pentile matrix, but OLED.
Sent from my Galaxy Nexus using XDA App

Yes i had nexus one galaxy s galaxy s II so i can compare,nothing like that before that.
50-60 percent of brightnes

I have the Galaxy Note and it has the same panel as the Galaxy Nexus albeit at 1280x800 instead of the Nexus's 1280x720. (Super AMOLED HD with Pentile sub-pixel arrangement)
My screen is great. The whites are brighter than they were on the Nexus. The Nexus displayed whites with a yellowish tint especially on low brightness. Plus I can't seen any banding on the screen and I have tested it on White, Red, Blue, Green and Grey backgrounds.
Im getting a new Galaxy Nexus in a couple of days. Since this unit is from a later batch I hope that there is no banding on the screen too.

Funny, I have a similar issue to Delarock's on my Galaxy S2, manufacturing date is 19th of October. I'm still thinking whether to replace it or not since since it's only visible on dark'ish grey, I couldn't replicate it on lighter greys, white, or any other color at various brightness settings.

Delarock said:
Yes i had nexus one galaxy s galaxy s II so i can compare,nothing like that before that.
50-60 percent of brightnes
Click to expand...
Click to collapse
the same on lowest brightness...
so I always set up my phone to the hightest brightness

Hard for me to get a good photo but you can see the same problem on my NEXUS S screen. Its just a characteristic of OLED displays in general.
Sent from my Galaxy Nexus using XDA App

Really similar to the screen on my new Galaxy Nexus. I didnt notice the diagonal right away but that is certainly more significant. My screen a rosy hue in the bottom half and especially the lower left.

I'd love to see a similar picture of someone who says that their screen doesn't have it.
(Click for 100% crop)

So are some of these screens defective? Or is it really just the nature of the beast?
How does one tell what manufacturing date their device was made to? Would I be able to go to a store and exchange for a datecode that shows no banding issues?

I am having the same issue ... another thing I notice is weird issues with the camera while in a dark room. If I have my camera on in a low light room, I get this weird "dancing" of black blotches in the really dark areas of that room.
I like all solid black wall paper, I find the fastest easiest way to get it is to turn off the camera flash, put my finger over the lense and take a pic. Worked for every other phone I have but the GNex. I get a weird blotchy image ... now I am on GNex#3 (other 2 I returned for different issues) and I have noticed this camera thing on #1 and now #3. With the first one I assumed this was normal ... but after going from the second one to the third I see a HUGE difference in screens. With phone #2 I was able to do the phone/black wallpaper with no weird distortion. Now the really strange thing is that that same pic taken with the second phone (that displyed pure black on that device) shows up blotchy on device 3.
Hope this makes sense to someone lol cuz reading it back I sound crazy.
I just hope the folks at the Verizon store don't give me a hard time trying to get another one!

Galaxy Nexus - Purple Tint + Grainy Screen

Hey Guys,
I just got my GSM Nexus about 2 days ago from Germany (Ordered it online and my uncle bought it here in India for me). The phone is AMAZING! I love everything about it! Specially the screen... but I just noticed something. I was going through some thread regarding the screen of the Nexus. My phone has some serious contrast issues.
The black (Pure black), on the screen is perfect. Say for example - The navigation bar. But when the phone is on low brightness level, the greys turn into purple! This is a common issue, I know, just keep reading..
At low brightness level, I can see the grains on the screen, they are very much visible and all the greys turn into purples! NO idea why! It's actually really annoying, my keyboard, my settings background and notification drop down literally turns purple.
So searching for this issue, I tested the screen through this - http://www.lagom.nl/lcd-test/black.php - The first black, IS PURPLE ON THE PHONE. The background is pure black but the first black sample is purple!
I just noticed that even on 100% brightness I can see the grains and there are some purple stuff I can still see! Specially the starting of the gradient on the Settings menu.
I'm really worried right now. I have the bill/invoice of the phone. The warranty period is 2 year but I'm not sure whether they'll replace the phone's screen here in India through warranty or not. If not, I'll be so depressed.
Any idea as to what I should do?

I would contact them about the issue being resolved through warranty. The only thing I would be worried about if they did cover it would be if they exchanged it for a new one and it ended up having the same problem(since it seems somewhat widespread from what I have read). Not sure how the warranty works though. Best of luck to you!

I went through 3 Galaxy S II's before finding one that had an acceptable (but grainy) display.
My Galaxy Nexus has annoying SAMOLED issues as well, such as vertical lines and color banding, graininess, spots, etc. All I can say is don't expect a perfect screen, even if you get a replacement.

The biggest problem is - The Galaxy Nexus has not been launched in India -.-

I just sent a mail to the head of Samsung service but didn't get a positive reply they're saying that the replacement of the screen will be costly. Really disappointing.

I am really sorry to see that Samsung won't replace this phone. I had this same exact issue with the purple tint especially on low brightness. It is very noticeable on certain backgrounds or shades of black where it suddenly turns purple. The best example I could find was putting the standard color gradient wallpaper that comes with ICS and turn on the clock program and with the brightness on low turn the clock to dark mode and the purple shows up all over the place. It is quite annoying because this affects everything you do with the phone. Luckily I was within my 30 day trial period so I could get it replaced. The new phone is perfectly fine.

Had this happen to me on my replacement phone. Took it in to verizon and the reps thought I was crazy. I tried to explain that it was mostly visible with low light levels and that they should take it into the back and look at it but they just stood there. So, my third phone should be here today and I am going to be pissed if it has any issues.
I still think this is a great phone regardless of the above issues

Yeah I don't think it's the OP's phone that has the problem. I think all Galaxy Nexuses have the same problem.
Sent from my Transformer Prime TF201 using Tapatalk

Really disappointing though. I paid a hell lotta money for this thing It's the GSM version..

I always assumed that this was the standard color pattern of the Gnex. Mine has it, and I've gone through 3 screen replacements so far and all of them had it.

From what I heard Supercurio might be working on Voodoo Color for the Galaxy Nexus so hopefully it will be able to adjust the colour balance so the grey looks more grey. As for the grain effect I don't think there will be a way to fix that since from what I read it is caused by pixel inhomogeneities.
Anyway if it makes the OP feels any better once you get used to it you hardly notice the problems at all unless you specifically look out for it. Any screens you buy have some sort of imperfections and the Galaxy Nexus's is definitely one of the least imperfect.
Sent from my Transformer Prime TF201 using Tapatalk

It took me 3 exchange to get rid of purple but now I have vertical banding.
Quality control sucks...it just that simple.
Sent from my Galaxy Nexus using Tapatalk

I don't have any grain, but my keyboard looks purple from ~20% and lower brightness. Bit of a shame, it's the only chink in this phone's armor so far, but it ceases to become an issue at ~50% brightness, which I use. Until now I thought it was a part of the ICS colour pallette as even pulling up a sample of dark grey on Google doesn't replicate the purple

Such a weird issue this is! I also have an HTC Sensation with Vanilla ICS 4.0.3 - The greys are perfect due to the SLCD panel, no grains too!
But meh, whatever! The Nexus's screen is sexy! So pure! (At high brightness levels)
I'm always going to love it

Okay great news! I talked to the manager of Samsung Mobile India CC - He agreed and told me to visit the nearest service center. But now it depends on the SC to change the screen or not.

I think this is just normal for this phone...I just got mine and its purple too...no biggee... still an awesome screen.

ezcats said:
I think this is just normal for this phone...I just got mine and its purple too...no biggee... still an awesome screen.
Click to expand...
Click to collapse
Exactly! Do you have a grainy screen too?

My first Galaxy Nexus seemed perfect, I didn't even know about these screen problems, because mine didn't have them and I so I really ignored topics about screen problems.
Then I swapped it out for a cheaper open box Galaxy Nexus. Now I'm seeing a purplish tint to my dark wallpaper when I have the brightness level down. And more troubling is I seem to have a grainy effect mostly visible on grey backgrounds at any brightness level (I see it a lot with the Market and Kindle apps). I don't seem to have a grainy effect with other colors though that I notice.
Little disappointed. But don't think there is much I can do because it was an open box. Doubt the retailer would let me exchange it. Does Samsung offer warranty support for the i9250 in the US? I go to Samsung's support website and enter my i9250 model number and it just says invalid.

Ravynmagi said:
Does Samsung offer warranty support for the i9250 in the US? I go to Samsung's support website and enter my i9250 model number and it just says invalid.
Click to expand...
Click to collapse
Just find a service e-mail ID and send them a mail! That's what worked for me! They'll reply back by the next day. Try to convince them as much as you can!

The purple may be common, but it's certainly not normal. My first GN had deep blacks and very nice neutral greys. But it had two dark blotches that were visible on a black background without having to be in total darkness - just evening lighting would make them visible. But the colors were similar to the Nexus S it is replacing. The replacement GN I got has the normal amount of graininess at low light settings, which is acceptable to me, but the colors have a very purple tint and the contrast is not very good - holding it up between the first GN that I have to ship back and the Nexus S makes the purple and low contrast very obvious. Maybe third time will be the charm....

[Q] Warm vs Cold Phone and horizontal banding

I've had my phone about a week and the screen is fine when I'm inside. But I noticed on the way home from work (I walk from my work, about 10 minutes away) that the more I took my phone out, the more I noticed horizontal banding. It freaked me out a bit (I bought this phone from Swappa), but as I got back in a warm environment, the banding went away. Went back out for a run and it did the same thing.
My question is:
1. Is this normal behavior for AMOLED screens, for this device, or is it a defect?
2. Will this temperature change hurt the phone? I live in Wisconsin and odds are it's going to be cold a lot.
3. Should I get a snuggie for my phone?

Never noticed any banding, perhaps i'm not really looking for it.
Will look out for it when my phone gets back from the service center..

Take mine skiing all the time. No banding.
Sent from my Galaxy Nexus using Tapatalk 2

Mach3.2 said:
Never noticed any banding, perhaps i'm not really looking for it.
Will look out for it when my phone gets back from the service center..
Click to expand...
Click to collapse
Well I've read up a bit on horizontal banding and i know it's common with this phone. But I've never had anyone say it's temp related.
Sent from my Galaxy Nexus using Tapatalk 2

I noticed this as well with my phone. I had horizontal banding all the time, but the banding seemed to be more pronounced when the phone was cold.
I returned it for a screen replacement under warranty and just got it back about a week ago. The banding is now gone and I don't see it when the phone is cold, either. I don't think the banding is normal but, if it is occurring, it can be made more noticeable when the phone gets cold.

Breaking news : the GN screen is crap.*
*there aren't any existing threads about it on XDA, not a single one. /s

When you say banding do you me slightly darker stripes (almost like shadows) or do you mean bright white horizontal stripes where no information can be seen.
I live in the north of Sweden and often subjected my old Galaxy S to -10 to -20°C. I would quite often see white banding or rows of white pixels. These always disappeared whed the phone was taken inside. The phone still works faultlessly today.

For me, the horizontal bands were linear "shadows" of lower screen-brightness alternating with linear areas of normal brightness. There is no loss of information.
After the screen replacement, I would say the screen is as nice as on any phone I've used. My last phone was a Nexus One, and the new screen is comparable in quality to the one on the N1.

[Q] Pink tint on lower half of screen? Normal?

Hey everyone,
I got my black AT&T Note 4 earlier today. I noticed the lower half of the screen is slightly darker, and has a slight pinkish tint on a white screen.
I do notice it in some apps, like Kindle when readinga book. Top of screen is slightly brighter, and when background is white there's a very slight pink tint.
Is that normal? Or should brightness be uniform and no tint?
EDIT: I added a photo. It's not a good photo but you can see how one side is tinted differently. In the photo the brighter top looks greenish but in real life it's not green. You can also the slight pinkish tint in the bottom half, which is the left side of the photo.

I wouldn't want to comment based on the image you uploaded directly since how a camera captures a digital display is much different than what the naked eye will see. If the picture on the panel is not consistent and appears polarized in any way, I would consider that to be faulty. Get it replaced.

Galaxy Note 4 (pink tint lower screen)
Hi there,
I have also noticed a pink tint on the lower half of the screen on new Samsung Galaxy Note 4.
As i intend to do a lot of drawing on this device the tint is unacceptable.
I wonder if there is a way to calibrate the display?

I had this issue with my Galaxy S3 display. I had at&t exchange it.

Have this same issue on my Note 4. Posted some pics over in the thread on this topic for the Note 3 before I thought to check here. Basically there's a brightness and gamma gradient from top to bottom. The top half is perfect and the bottom half gradually fades to a point where you lose the first 8-9 squares on the lagom.nl black level test.
This one emphasizes the black crush, which can be visible in video content on a dark screen (and makes dark colored backgrounds fade to black towards the bottom):
And here's one on a white background. At first it seems like a white point issue (which I would tolerate since it's common on IPS as well), but it's a brightness gradient:
Between this and the fact that AT&T disabled the slider for auto brightness I'm a little frustrated with this supposed best smartphone display ever (I realize this second issue isn't Samsung's fault, but the auto brightness is unusable without that feature). I bought the phone at Best Buy which is mostly out of stock right now so an exchange isn't likely, assuming they even take this seriously as an issue.

My note 4 does not display this issue.

No issues here. Display looks very consistent.

mkalbarc said:
My note 4 does not display this issue.
Click to expand...
Click to collapse
Have you tried a dark background in a dark room? For me it wasn't that obvious until I did this (was messing around in Sketchbook). If the majority of screens are better than mine I'll definitely be trying to get a replacement as this is bothering me.
I just installed Lux to resolve my backlight issue and its settings menu background fades nearly entirely to black at the bottom.
*Edit: So far it sounds like this is an anomaly. You would expect places like Anandtech to report on it if they'd seen that amount of variation. I'm going to have a good time trying to convince someone at BB that this is a real defect though.

Erica Griffin talks about this issue in her Note 4 review, around the 20 min mark: https://www.youtube.com/watch?v=-OyNWrQJzMY

I got a replacement and it's perfect. No pink tint.
So, if you have the tint return it. Not all Note 4s are like that.

msk said:
Erica Griffin talks about this issue in her Note 4 review, around the 20 min mark: https://www.youtube.com/watch?v=-OyNWrQJzMY
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Click to collapse
Thanks, that was quite helpful. I think in general it's easier to trust reviews on retail-purchased devices over mainstream reviews with PR department selected units.
I went to BB today and looked at the display units. All perfect, but then that's not surprising (every company gives their display/review units a second QC pass, even Apple). I'll probably head to the only BB in the area that has units tomorrow and see if I can do an exchange. As long as they don't make me sign one of those "no more returns" agreements I've heard about I'm willing to take another shot in the display lottery.
TapperP said:
I got a replacement and it's perfect. No pink tint.
So, if you have the tint return it. Not all Note 4s are like that.
Click to expand...
Click to collapse
Good to hear! I'll post my results after my exchange attempt tomorrow. Aside from the gradient I am impressed with the display. Not as bright as LCD in daylight, but I was drawing on a black BG last night and noticed that it has deeper blacks than my Pioneer plasma.

Atomic Walrus said:
Good to hear! I'll post my results after my exchange attempt tomorrow. Aside from the gradient I am impressed with the display. Not as bright as LCD in daylight, but I was drawing on a black BG last night and noticed that it has deeper blacks than my Pioneer plasma.
Click to expand...
Click to collapse
Fingers crossed for you to get a nice one like mine.
Yeah, the blacks and colors are amazing on the Note 4. The whites are not as bright as the iPhone 6+, but they are fine and way better than whites on my Note 2. In all other respects the Note 4 screen is overall better than even iPhone 6+'s excellent LCD.
One minor disappointment is the very high resolution has made some emulators dog slow as they attempt to render at full resolution, i.e. PPSSPP and ePSXe using ogle renderer. Hoping the devs find a workaround, maybe rendering at half or quarter rest instead - that would still be higher rest than my Note 2 at full rest. :laugh:

What's the color of your device? Anyone have this problem in the white version?

my note 4 has pink tint
I have the same problem on my Verizon white note 4 but on top half of display. Replacement should arrive by Friday :/

You can replicate this by looking at the screen at an extreme angle, obviously the ones that see green and purple straight on are screen defects.

I have a white version and whites are perfect and too bright at high setting. I keep mine half way. The whites are better IMHO than the iphones. The colors more vibrant and, the sharpness is ridiculously sharp. I dont see how they can improve it. I only thing there should be a waynto adjust the color saturation, because basic mode doesnt do much on mine.

My Note 4 has the same issue. It almost looks like the while balance differs from top to bottom, but it is really the brightness that is different.
This is a photo of my Note 4 showing a solid colored image at #030303 (very close to black). It shows how different the pixels in the bottom and in the top emit light.
Image can be seen at 1x.com/tmp/uniformity_note4.jpg
Looks like crap.
/ j

I though i had ocd with phones but that just doesnt bother me in the slightest. Cant really tell unless you force yourself

http://forum.xda-developers.com/showthread.php?p=56562683

similar problem
I have a similar issue, though mine is brighter on the right side than it is on the left. Very noticeable with dark background in lower light situations as someone else mentioned.