Develop Bugs

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!

Note 2 screen defect on pure black screen in darkness

On my Galaxy Note 2, if I display a pure black screen in a completely dark room, I can see that first of all, the "black" is not really black, but somewhat pinkish. And second of all, there are "really black" dots and lines across what is supposed to be "pure black" but is somewhat pinkish (like i said). Also, this effect, of having a darker line, can also been seen with say, dark blue on screen in a completely dark room.
This effect is not noticeable when white or other colours are on screen. I'm really sorry but I can't show you a picture of this because obviously a screenshot captures the digital signal and not the physical output and I don't have a good enough camera to take pictures of what I'm saying in complete darkness.
Is this a defect or just an unavoidable "feature" of Samung AMOLED screens?

you did not use the search function: i personally wrote a huge amount of posts regarding this, also in the note1 section!
search for "black blotches" or take a look at my posts. really lots of them are about this!
in short:
its manufacturing dependant and its luck of the draw to get a "good" screen!
samsung lives with this as not many customers complain(ed) about it, as most of them do not even notice it!
Sent from my GT-N7100 using xda premium

jeanclaudevandamme said:
On my Galaxy Note 2, if I display a pure black screen in a completely dark room, I can see that first of all, the "black" is not really black, but somewhat pinkish. And second of all, there are "really black" dots and lines across what is supposed to be "pure black" but is somewhat pinkish (like i said). Also, this effect, of having a darker line, can also been seen with say, dark blue on screen in a completely dark room.
This effect is not noticeable when white or other colours are on screen. I'm really sorry but I can't show you a picture of this because obviously a screenshot captures the digital signal and not the physical output and I don't have a good enough camera to take pictures of what I'm saying in complete darkness.
Is this a defect or just an unavoidable "feature" of Samung AMOLED screens?
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Mine is pure back at full brightness when seen in a dark room (no pinkish hue or any line that you mention). And Note 2 screen doesn't even have the infamous black clipping/crushing issue like its predecessors! Blue colour also good, no issues for me.
No, it is definitely not an AMOLED feature or drawback (never seen it on any other AMOLEDs either)! Of all other aspects samsung SAMOLED screens are known to have the deepest blacks (with best contrast ratio). Sure, it sounds like you have a defective screen, and my suggestion would be to get it checked up at SC for replacement.

i also have a similar issue on my note 2. a black screen is not completely black, but a brownish black. And i can see 3 (or more) dots which are completely black.. i can see this only in a dark room, so normally this is not an issue. But when i read kindle in my bed with dark background, this really bothers me. initially i thought this was some smudge on the screen. im sad to hear that other people are also having this issue..

I had the black dots on my galaxy s2 ... but not my note ... The screen on my note has none of that sooooooo happy about that it really is just luck of the draw ....
Sent from my SGH-T889 using xda premium

Same issue here. But it does not bother me that much, and if I get it replaced, the next one might have worse issues.
Sent from my GT-N7100 using xda premium

im only worried if it will grow in time. like a dead pixel in an LCD screen, if this phenomenon spreads to the neighboring pixels over time, then its a very bad thing... otherwise, i am not bothered at all..

We need this thread each time there is a new phone which amoled screen? ..
The sgs2 has this as well as the sgs3 the note 1 etc.
it's not a defect, it's a limitation of amoled screen production.
Sent from my GT-N7100 using xda premium

Dpk1 said:
Mine is pure back at full brightness when seen in a dark room (no pinkish hue or any line that you mention). And Note 2 screen doesn't even have the infamous black clipping/crushing issue like its predecessors! Blue colour also good, no issues for me.
No, it is definitely not an AMOLED feature or drawback (never seen it on any other AMOLEDs either)! Of all other aspects samsung SAMOLED screens are known to have the deepest blacks (with best contrast ratio). Sure, it sounds like you have a defective screen, and my suggestion would be to get it checked up at SC for replacement.
Click to expand...
Click to collapse
Sorry, what you say here its not possible! EVERY amoled 'suffers' from this ('cause it CANNOT display 100% blacks, due to it's active matrix)! If you won't see it it's because of a wrong method or your eyes!
Sent from my GT-N7100 using xda premium

[Q] Who else is getting the dingy yellowish white color problem?

So my Note 2 and some others are experiencing dull and yellowish white contrast as talked about in this POST. Also this POST shows the Note 2 being much brighter. We've tested this with both units on high brightness and dynamic mode on, with the browser brightness all the way up as well. I even did a hard reset, and the low brightness dingy whites are still there on the Note 2. I'm looking into returning the phone for a replacement through the AT&T store I bought it from. Most people don't have this problem on their Note 2's so it seems like its only affecting a few units, but we need to get this out in the open. Maybe there are two different panel types shipping out. Please check and compare your Note 2's white's brightness compared to other Note 2's and other original notes and report here.

I'm also seeing the same dirty white screen. I might go to the local AT&T store to compare it with another Note 2 if they have a demo unit. If anyone can do this and get side by side comparisons I'd like to see this. I hesitate to do a replacement because they are probably only going to offer a refurbished unit as a replacement and the chances are it's going to be another unit with the same issue.

dstech said:
I'm also seeing the same dirty white screen. I might go to the local AT&T store to compare it with another Note 2 if they have a demo unit. If anyone can do this and get side by side comparisons I'd like to see this. I hesitate to do a replacement because they are probably only going to offer a refurbished unit as a replacement and the chances are it's going to be another unit with the same issue.
Click to expand...
Click to collapse
The AT&T store said they would order me a new one. When I called customer care (611) they would only offer a refurbished phone. So stick to the exchanging it at the store. The store I bought it from doesn't have any more in stock but are willing to order me a new one.

You know what stop comparing note 2 to other screens. Every screen has different color calibration and software versions effect this.
My first phone was galaxy s1 and the screen seemed fine since I had no other phone to compare but I compared to my ipod touch 2nd gen. Sgs1 had blue tint. Then I got sgs2 and the screen was very purplish compared to my friends sgs2.
I was obsessed to get the perfect screen so I changed it 5 times. 1 for the dead pixel and 2nd for the white spot on tje screen and the last 3 for the purplish hue. 3rd phone was really purple and obviously something was wrong. And I checked all the phones that are on display in various stores they had yellowish hue. But still compared to sgs1 it had warmer whites. Now I have note 2 and I recently put all 4 of them side by side and compared.
Sgs1: cool blue tint, looks very unnatural.
Sgs2: has a red hue compared to sgs1 but still looks not as warm (red) compared to itouch.
Note2: compared to sgs1&sgs2 it has a warmer white, much much better color balance of them all. However compared to itouch I realized it has a yellow hue.
BUT!!!! I compared it to my laptop's white and 40" lcd tv's white, note 2 still as not yellow as my laptop and tv.
If I were you I would try to enjoy the phone instead of comparing it unless its an obvious defect. Each screen is different and has to be calibrated. Its just means the calibration is different then other devices.
I have to admit, when I compared note 2 to itouch I was surprised by the yellow hue but I am not gonna go and change it again. Not every 2 screen is the same.
Think that your "note2 doesnt have a yellow hue" , maybe its your old note has a blue hue?

Also if you tilt the screen and look it from different angles you will see yellow hue disappear. I had the exact same thing on sgs2. You have to live with it. I am %100 sure even if you change 5 times you will end up with the same problem.

Wow fukn bs yellow ****
Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

warfanax said:
Also if you tilt the screen and look it from different angles you will see yellow hue disappear. I had the exact same thing on sgs2. You have to live with it. I am %100 sure even if you change 5 times you will end up with the same problem.
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Click to collapse
warfanax is pretty right I went and exchanged it today for another note 2 and it looks the same an 4 units tested in store, all had warm whites....so that being said the OG note still has a brighter "looking"screen and brighter whites even if they are blue it gives the appearance of being brighter. Oh well, I'll live with it for the quad core and 2 gigs of ram though. Cant have everything...

I don't have the programming knowledge but don't think an app that changes screen colors is very hard to make. Some kind of color boost is already included in our phones in display section.
There was an app like that for sgs1 that let you tweak RGB colors.

warfanax said:
I don't have the programming knowledge but don't think an app that changes screen colors is very hard to make. Some kind of color boost is already included in our phones in display section.
There was an app like that for sgs1 that let you tweak RGB colors.
Click to expand...
Click to collapse
Like this
https://play.google.com/store/apps/details?id=com.netmanslab.sa

Futant55 said:
Like this
https://play.google.com/store/apps/details?id=com.netmanslab.sa
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Click to collapse
Thanks for the link but that app only washed the screen out with the contrast adjustment. It washed out the black levels. I just realized that I'm running Paranoid Android on my original Note and under Settings>Display there is an option for filtering and dimness. Its set to (20) by default. If I lower the number to like 10 it then matches my note 2's screen brightness at 100%. Its as if this Paranoid Android setting makes the back light on the Note 1 put out brighter (while killing battery life I'm sure) while still keeping the black levels black. Could this setting be what is making my note look brighter than my note 2 and can settings like those be applied with a new rom or an app on the Note 2?

I exchanged out my Grey GN2 for a white version for another defect issue yesterday and the screen on this new phone is definitely whiter. I'm happy, but I agree with others that the yellowish screen was probably due to normal manufacturing tolerance variations.
Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

I'm within my 14 day window so I'm going to go to the ATT store and compare mine to another GN2 and if mines deficient I'll have them replace it. Will post back with results in a few days.
Sent from my Nexus 7 using XDA Premium HD app

[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.

[Q] S4 Mini bad screen quality?

I just bought a S4 mini and flashed cm12.1 as I did not intend to use Samsungs Android.
I immediately noticed that the screen looks dirty/grainy
This can be seen best on the "power control widget" background. It looks like a sand paper texture.
But I see that on every not over saturated single colored area also.
I am aware that all AMOLED display do not have super good accuracy, but it is not that I have to stick my face to the screen to notice.
I see this every time without any effort and I find it ugly. It just looks dirty.
I compared with my PS VITA (1st gen) AMOLED and I really really have to concentrate and try hard to see that dirty look there. It is far more clean than my S4 Mini display.
Can anyone confirm? Or is is just bad luck with my unit?

I noticed this too since I got my first S4 mini.
I have two phones and looked at other ones (store, friends). All are the same - grainy.
It's not because of the PPI, I have other phones with lower PPI and backgrounds are clear.
It's most probably because S4 mini doesn't have the "classic" subpixel layout where RGB are close to each other.
The used arrangement is this: https://upload.wikimedia.org/wikipe...pg/1280px-Samsung_Galaxy_Note_2_subpixels.jpg

nick_white said:
I noticed this too since I got my first S4 mini.
It's most probably because S4 mini doesn't have the "classic" subpixel layout where RGB are close to each other.
The used arrangement is this: https://upload.wikimedia.org/wikipe...pg/1280px-Samsung_Galaxy_Note_2_subpixels.jpg
Click to expand...
Click to collapse
Hi thanks for confirming and thanks for not telling my that I am crazy
But the reason is not only the strange subpixel layout. It seems to be also just bad quality.
Our strange subpixel layout leads to color edges left right top and bottom of a white square on black instead of just left (red) and right (blue), but apart from that it should produce clean single colored areas (whicht it obviously doesn't).
The Vita in addition to producing better single colored areas has the real RGB stripe layout which reduces color edges. I wonder why Samsung gave up on these. Maybe it was too expensive to build(?)
http://mydevelopersway.com/ru/wp-content/uploads/2013/08/Display-Sub-Pixels.png