Mura Effect & AMOLED Displays (Note II)

Mura Effect & AMOLED Displays (Note II) - T-Mobile Samsung Galaxy Note II

Most of us know by now the limitations of Producing AMOLED Displays for devices such as the Galaxy S, S2, Note 1, S3, and Note 2. All of these devices share the same screen-technology. There is always praise for OLED, but the technology is still pre-mature; that is why when you look at your display in the dark, you come across something called, the Mura Effect. Some folks claim they don't have it on their AMOLED displays. However, all AMOLED displays have this limitation. Obviously, Samsung doesn't want to tell you this. Some might then consider their phone to be defective, whereas some won't.. There is some degree as to how much Mura Effect your display has. Some displays have the Mura Effect in the form of black lines, / blotches, & dots, and some will have them in the form of faint stains, which can only be looked upon when viewed closely in the dark.
From my understanding, the Mura Effect occurs due to the way the display is aligned with the TFT. AMOLED displays are assembled in two layers, the OLED film on top, and the transistor plane below. Due to limitations of the manufacturing process, it is very difficult to get both layers aligned correctly & perfectly to produce a uniform, seamless, display; note that AMOLED displays are very thin. The contacts of the transistors which power the OLED screen are not 100% set on our displays. Therefore, problems begin to stir when you bring the brightness down to the minimum level; insufficient voltage prevents all the pixels on your AMOLED display to light uniformly. That's why brightness unformity issues are very common in AMOLED Displays as well. Voltage is too low at low brightness to get flawless picture quality. The low voltage at low brightness is too low to power all the pixels effectively in our displays. This explains why the Mura Effect shows.
I've made some interesting observations on the past AMOLED display's I've dealt with in the past.
1). In Displays which do not consist of black lines and blotches, but do consist of blocks of faint black stains entailing the Mura Effect; and faint horizontal lines (which become more prominent overtime), burn-in faster, and brightness uniformity issues, become quickly apparent in these particular displays. Colors are warmer compared to the contrary. Some yellowish tint / pink hue is also to be spotted.
2). Whereas, in displays which do display their Mura Effect in the form of lines of little blotches / dots, tend to have a better color reproduction & brightness uniformity, and do not show faint horizontal lines quickly overtime; though they eventually do due to the organic (half-life) nature of OLED's. Yellowish-tint is rarely found. However, blue-tint is more apparent on displays with this degree of Mura Effect.
[Note: Yellowish tint is not the result of glue (common in LCDs); the Yellow tint is a calibration issue, and though sometimes kernel / software updates may resolve the issue, the yellow tint is not completely gone].
My ultimate question is, does the kind of Mura Effect on the AMOLED screen on each Note 2 unit manufacture thus far determine the life expectancy of the display itself? What about the formation of dead pixels? Do dead pixels (due to low-voltage effect) form frequently depending on the extent of Mura Effect on our displays? If my display for instance has black lines / blotches / dots, does that increase my chances of living with a dud phone?

Re: How Does Mura Effect Affect AMOLED Displays In Terms of Life Expectancy?
My guess would be, that by the time the mural effects the screen negatively (if at all) you will have moved on to a different phone. As opposed to a TV which is expensive and you'll be keeping it for way longer than a phone.
That's just my 2.cents
Sent from my SGH-T889

Similarly explained in the following thread from last week,
http://forum.xda-developers.com/showthread.php?p=36908128
The AMOLED Displays use an "Active-Matrix" compared to standard OLED's in today's flag ship televisions which do not have an Active Matrix.
In AMOLED, as a result of continuous low voltage that is being fed into OLED via the TFT even in the lowest brightness, the blacks won't be necessarily black.
Every Note 2 has the Mura Effect like in previous Galaxy Devices. However, the manufacturing process has slightly improved, but not to the extent we all would like it to be.
Unfortunately, I don't consider our displays to feature local dimming, because individual pixels do not actually turn off. Blacks are not blacks, as a result of the varying voltage.
Although there are improvements to the AMOLED display as explained here,
http://www.ignisinnovation.com/technology/ignis-technology-overview/ignis-admo-p-technology
Unfortunately, even though the solution provided in the above link by ignisinnovation has been in the market for a couple of years already, Samsung does not employ these kind of standards, therefore every AMOLED display has the Mura effect but in varying degrees such as in the form of stains, lines, blobs, dots, and splothces. This can also affect the display output when it comes to uniformity because the TFT is solely responsible for the luminescence of individual sub-pixels on the OLED film.
The AMOLED displays are improved with compensation.
http://www.youtube.com/watch?v=ctA114zaY98
When I say manufacturing has gotten better, I meant that Samsung's method of making slightly better AMOLED displays has been accomplished by changing the voltage and better quality control handling.
The material has been slightly improved; the material used on today's AMOLED displays is purer than let's say the material that was used on the S2 and Note 1.
Let's hope that future AMOLED displays by Samsung will be free of Mura and other Quality Defects.

Compesation for a Relaxed Area,
http://www.youtube.com/watch?v=tFgo6CIZgmo

I've noticed that the screen on my N2 is MUCH better than the screen on my old GS2. That phone had blotches galore, and my N2 only has 2 small, barely noticeable blotches. Better manufacturing & QC is pretty clear by the quality improvement.

That's very agreeable. However, a few Note 2 users have also reported severe blotches on their displays.
What has improved is the number of devices that have left the Samsung Factories with those type of displays.
They are far fewer screens on the Note 2 that have severe Mura compared its older sibling, the Galaxy S2. :good:
kabuk1 said:
I've noticed that the screen on my N2 is MUCH better than the screen on my old GS2. That phone had blotches galore, and my N2 only has 2 small, barely noticeable blotches. Better manufacturing & QC is pretty clear by the quality improvement.
Click to expand...
Click to collapse

Is this mura the reason i see some color around black text on white background. Kinda makes the text hazy sort of speak. I assume some displays if put together right wont have this issue. Compared to my s3 which has sharper lines so I find reading on it much better on the eyes. Also my note 2 screen has a warmer tint (even when screen set to standard) vs my s3 which is more cooler.
Sent from my ASUS Transformer Pad TF700T using Tapatalk 2

What you are describing is completely isolated, and the tint varies from display to display. Because the AMOLED display involves an organic layer, you won't find each display appearing the same, although, white should be white, and when there is too much tint like yellow and pink, then your best option is to get the screen replaced.
aznmode said:
Is this mura the reason i see some color around black text on white background. Kinda makes the text hazy sort of speak. I assume some displays if put together right wont have this issue. Compared to my s3 which has sharper lines so I find reading on it much better on the eyes. Also my note 2 screen has a warmer tint (even when screen set to standard) vs my s3 which is more cooler.
Sent from my ASUS Transformer Pad TF700T using Tapatalk 2
Click to expand...
Click to collapse

winlinmac001 said:
What you are describing is completely isolated, and the tint varies from display to display. Because the AMOLED display involves an organic layer, you won't find each display appearing the same, although, white should be white, and when there is too much tint like yellow and pink, then your best option is to get the screen replaced.
Click to expand...
Click to collapse
Thanks for the info.
Sent from my ASUS Transformer Pad TF700T using Tapatalk 2

S4
My note 2 shows a greyish background in a black wallpaper in the dark but my friends galaxy s4 doesn't. Does it mean the s4 doesn't have mura effect?

I have no idea what you guys said.. But does that mean if I keep my screen on lowest brightness setting, I'll kill my screen faster? And I was wondering what those bloches were. I thought water got in it or something,

How do you see those blotches and other indication of Mura effect? Can it be seen using screen test? My screen seems to be fine after running screen test though.

For me, ,it is when I'm watching YouTube and the screen is black for any possible reason. Then I see some spots that are darker . Try to load a black picture and loom closely.
Sent from my SGH-T889 using xda app-developers app

to test this get into a dark room like 100% black or under a blanket and open a black image

Is this mura effect the same thing that the note1 had? The darker pixels? Because if thats it ive yet to find one on my note2
Sent from my SGH-T889 using xda app-developers app

This is pretty interesting information, has anyone had such a problem with it that they tried to claim it under warranty? Or does anybody know if something like this or even "burn-in" would be covered by warranty, and has anyone actually tried yet? The reason I'm asking is because I had no clue that burn-in was possible on Amoled screens (this is only the second device I've owned with one), so I found out the hard way by using an alarm clock app every night at first, and it actually burned in the digits in less than a week. I tried using some dead pixel fixer apps which didn't do anything (even though I knew it was going to be pointless), so I still can see the burn in on almost every white or blue screen. I've considered trying to file a warranty claim but I honestly don't know if they would even do it or not, so I just thought I'd see if anyone else has tried. The worst case scenario is that I have insurance so I could just make a claim, but I'd rather not pay the deductible if I don't have to. It's also not extremely bad because I have to point it out or most people don't even recognize it even if they've been using my phone, but the point is that I know it's there. Anyway I'd appreciate some feedback from anyone with the same problem on what you've tried. Thanks.
Sent from the bag phone in my Pontiac Fierro

Wow then I have horse shoes up my ass cause I've never had any of these issues even on the lowest light settings my phone looks perfect and I had no issues with my s3 as well
Sent from my SGH-T889V

Keeping your AMOLED Display at lowest brightness will help prolong the panels' life. Avoiding blue colors is wise; as the blue colors in any AMOLED display are susceptible to easy burn-in due to its poor engineering. Howeverm the Galaxy S4's blue pixels are more susceptible to burn in (due to its Pentile Matrix) than the Note 2's. (which uses a real RGB stripe) Both models sport different AMOLED panel technology. The Galaxy S4 will has Mura Effect too (Check out the respective forums; its a shock). Samsung doesn't seem to realize that solutions are there, instead the company hides the problems under a rug.

I have had 3 AMOLED Galaxy S family phones, and used root apps at night to lower by brightness past what stock lets you go, and I have never see any inconsistencies in my screens, even at 1% you can still see every pixel.... I must have got lucky to have screens that were in perfect alignment lol... :highfive:

I was wondering if mura could be white blotches as well? I have some uneven backlighting it seems on my S4 near the bottom right. I almost thought it was burn in. It's a lighter blotch that's only noticeable in the dark with a dark gray/black background up and it's in the form of a circle. It's not a "blotch" though and seems to not be apparent during actual "full black" backgrounds...
I wish I could capture a photo of it but it doesn't really show up on the photos I've attempted to take in the dark.

Related

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!

Found black blotches on my screen

Okay. so I have a few black blotches on my screen, but I can only see them on a certain kind of black, but here's how to tell if you have this issue go to phone click on the menu key than call settings now go to call rejections from in there look at your phone screen at all every angle possible, if you don't see black blotches than you don't have an issue like I do.
Good luck
Also try doing this in the dark

Andrew149 said:
Okay. so I have a few black blotches on my screen, but I can only see them on a certain kind of black, but here's how to tell if you have this issue go to phone click on the menu key than call settings now go to call rejections from in there look at your phone screen at all every angle possible, if you don't see black blotches than you don't have an issue like I do.
Good luck
Also try doing this in the dark
Click to expand...
Click to collapse
Looks like a manufacturing defect, the blotches are in the same place on everyone s phone.

Weird mine are on the bottom half of the screen
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

It's normal. Samoled at its finest.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

I don't see them on that screen because the blacks are too black also I'm in a brighter lit room. But if I am watching a movie and it goes dark I can see minor blotches.

I noticed this and I took it to warrenty but they refused to replace or fix it. I dunno what to do. Is this breach of contract?
lalala SGS3 lalala

You would have to LIVE WITH THE STAINS AND BLOTCHES...
This is widely known issue known as OLED "mura" effect
It has stains and many black dots affecting the Galaxy S2, Note, S3, PS Vita and even some of the Galaxy S1 devices...
This is due to cheap manufacturing and QA ...

mms6 said:
This is due to cheap manufacturing and QA ...
Click to expand...
Click to collapse
Is it this, or is it a limitation of the AMOLED manufacturing process? My blotches are very minimal and I very rarely ever see them. I would much rather have the contrast of the AMOLED tech with the blotches than have my S3 equipped with an LCD.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

Definitely not an limitation of the manufacturing process.. My first-gen Samsung Captivate's screen blacks are actually deeper than the my Galaxy S3 with maximum brightness, displaying the same completely black #000000 screen in a completely dark bedroom at night...
Also what I have realized is that on my Captivate's screen, it do not has any of the stains or the dots on it when viewed in a dark room.. It has a little bit of "banding" problem on the top portion of the screen, but it is less noticeable than the stains and especially the "black dots" effect...
I have the EXACTLY same problem with my PS Vita similar to my Galaxy S3, but the PS Vita has much more stains than dots than the GS3 (more imperfection) although the PS Vita is lower resolution, and slightly bigger screen. The PS Vita uses the Samsung Super AMOLED Advanced (pentile matrix)...
Also, the screen production is not consistent on the GS3. My first GS3 has Wi-Fi random disconnection issues, so I exchanged it under the 15 days policy from Rogers, for another GS3.. The original GS3 has a lot of "black dots" (approx around 15 or so) and slightly stained on the top right corner.. The exchanged GS3 was slightly better and had no stain marks and only a few black dots and a slight pink spot (when viewed on white #FFFFFF).. Also I had to exchange my second one back to the store because my battery cover had some hairline cracks within a week of usage or so..
The THIRD AND FINAL GS3 I received did not have any stains, but suffered a more severe "black dot" effect (approx. 15-20 dots).. But my Wi-Fi issue was fine, and there are no pink spots, so I have been using it until now and did not really bother an exchange....
If you are extremely lucky, you might get a "perfect" or "near perfect" AMOLED in the current generation... But still the QA is going down the toilet when compared to my First Phone with Super AMOLED, my Samsung Wave S8500 (the screen was PERFECT on this one, NO stains/dots/smudges etc...)
Samsung is cutting costs and lowering QA because it is fulfilling more AMOLEDs for other manufacturers such as themselves (its is not just the top of the line Galaxy S# series using AMOLED, mid-end and some lower ends Galaxy series are using AMOLED as well) Also Samsung has to supply for Motorola, HTC (fewer models though), Sony (only for PS Vita), Fujitsu (for the Japanese Keitai smartphone from KDDI and Docomo) and so on.....
Now all this happened in quite short period of time, Japanese keitais with OLEDs came on the market last year... Samsung Wave came onto the market in 2010, there is only a 1 - 1.5 years in between here... The demand exponentially increased as smartphone sales went up, and more manufacturers are contracting Samsung to build OLEDs..
Personally, I do not think the process of making OLEDs have improved....
THE ONLY area it might have improved is probably the PRINTING... Printing higher resolutions has allowed Samsung to increase the pixel density and decreasing the subpixels (and this is probably why the Super AMOLED HD screens are dimmer than the original Super AMOLEDs at the same maximum brightness)
That is all I can say for now...
Live with the miniscule defects such as stains, dots, smudges etc on your OLEDs.... These problems are minor issues anyways since you have to be in a very dark environment with almost complete black #000000 image to be able to pick up the "defects".... Wait for a few more generations and allow the manufacturing process to improve more and still be able to fulfill Samsung's own demands and contracted demands for other manufacturers..... (Or other companies might finally bring more and more of their own technologies in OLED to the consumer masses)...
END OF RANTS...
-----------------------------------

It's normal ever since the hd samoleds came out. Same problem across many manufacturers. My razr was horrible with this stuff.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

robstunner said:
It's normal ever since the hd samoleds came out. Same problem across many manufacturers. My razr was horrible with this stuff.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
Click to expand...
Click to collapse
Mine has the defect but I only see it when in a very dark environment and only on a certain black type of screen. Normally the black screen that shows up when starting a Netflix video I will see it for a moment. It doesn't bother me that much but do agree that it looks like s***! Other than the blotches in a dark environment though, you'd never see it.

I also noticed these spots too. I do not think it is a big deal foudn a few threads talking about other phones and most people agree it is common and only effects the screen when theres nothing moving on it. In other words yes you will notice it but no your screen is not damaged.

Compesation for a Relaxed Area,
http://www.youtube.com/watch?v=tFgo6CIZgmo

I haven't noticed any such effects with the Note 2, but I did notice them on the Galaxy Nexus, when brightness was turned down 'below' what the factory minimum level was set to (20).

They still exist on all Note 2's in a form which appears less severe and is different from the one you observed in the Galaxy Nexus

winlinmac001 said:
They still exist on all Note 2's in a form which appears less severe and is different from the one you observed in the Galaxy Nexus
Click to expand...
Click to collapse
The only screen "defect", if you will, that I've noticed on my note 2 is as described below:
When a pure black screen is displayed and it is observed in a completely black room, there is a noticeable red glow emitted from the screen itself. Like the red sub-pixels doesn't turn off completely or something. The brightness contol affects the brightness of the prominent red glow.
Not really an annoyance, and I rarely even care, I just wonder why. I figure if the blacks completely shut off the sub-pixels, It would save battery power (a negligible amount)
I compared this same scenario on a Nexus S that my sister has, and her screen is completely black compared to mine (which glows red).
I just thought I'd make a comment on the subject matter.

hiii,
i bought my note 2 on 29-1-2013
now what i noticed in my screen,
there middle 10% part is shaded with 1% opacity,
if we look closely then it's not noticable as u seen from far,
from naked eyes is too difficult to see,
its not like Colours are gone, only looks like shade,
if i increase brightness to 100% then the small shade like finish.
i m confused that it is defected or not,
is that Normal, does nay body heard that type of case,
Please make me happy,tell me that it is Normal,I dont wana give my phone to bad service guys. :crying:

vebulous said:
The only screen "defect", if you will, that I've noticed on my note 2 is as described below:
When a pure black screen is displayed and it is observed in a completely black room, there is a noticeable red glow emitted from the screen itself. Like the red sub-pixels doesn't turn off completely or something. The brightness contol affects the brightness of the prominent red glow.
Not really an annoyance, and I rarely even care, I just wonder why. I figure if the blacks completely shut off the sub-pixels, It would save battery power (a negligible amount)
I compared this same scenario on a Nexus S that my sister has, and her screen is completely black compared to mine (which glows red).
I just thought I'd make a comment on the subject matter.
Click to expand...
Click to collapse
Thats normal on the Note2, between the Galaxy S/S2/Note1 the note 2 has the 'brightest' blacks while the S1 has the dimmest and they dont really shut off.

I have these dots and lines on my note 2, galaxy s3 (changed 5 times and all of them had it) and my galaxy s plus
Sent from my GT-N7100 using Tapatalk 2

lopman said:
I have these dots and lines on my note 2, galaxy s3 (changed 5 times and all of them had it) and my galaxy s plus
Sent from my GT-N7100 using Tapatalk 2
Click to expand...
Click to collapse
Had dots on my Galaxy S2, dots and lines on my Note 1, dots/lines on my Tab 7.7
No dots/lines on my Galaxy S and Note 2

I've noticed that the black levels have changed over the last couple of Galaxy-line generations. I never saw anything significant with the Galaxy S, but that was because the blacks were more dark. Moving further into the subsequent years, the blacks began showing the Mura Effect very prominently. Every AMOLED display will have its quality variations. The units that do have the "noticeable" Mura Effect may even survive longer than the units that do have Mura Effect, but without lines, dots, and other artifacts. Its a give or take; if you buy a new AMOLED unit today, you will definitely come across some artifacts, especially dots. Each display manufactured requires special attention in order to perfect the manufacturing process, but this almost never happens in Samsung's assembly line, only because AMOLED technology is a very delicate piece of hardware.

hi.. i have an international SGN2 with normal super AMOLED display which is too much in contrast. if you want to have a crystal clear display why not choose true hd ips screen?
sorry my english..

Many don't choose the True HD IPS screen because many have the misconception that AMOLED displays provide a better color gamut, therefore a providing richer colors, accurate RGB, and premium experience. However, this is no longer necessarily the case. True HD IPS Displays have come a long way and are now thought to be leading the way for mobile displays. AMOLED is not the same as true OLED which provides deeper blacks and bright whites. Even though in an AMOLED display, individual pixels do turn off in the presence of black, the active matrix leaves the transistor film actively on. That's where the term Active-Matrix comes from. So much for AMOLED. It is speculation that Samsung may use SLCD's on their Samsung Galaxy S4 this year, according to a recent article on GSMArena.
rymote said:
hi.. i have an international SGN2 with normal super AMOLED display which is too much in contrast. if you want to have a crystal clear display why not choose true hd ips screen?
sorry my english..
Click to expand...
Click to collapse

winlinmac001 said:
Many don't choose the True HD IPS screen because many have the misconception that AMOLED displays provide a better color gamut, therefore a providing richer colors, accurate RGB, and premium experience. However, this is no longer necessarily the case. True HD IPS Displays have come a long way and are now thought to be leading the way for mobile displays. AMOLED is not the same as true OLED which provides deeper blacks and bright whites. Even though in an AMOLED display, individual pixels do turn off in the presence of black, the active matrix leaves the transistor film actively on. That's where the term Active-Matrix comes from. So much for AMOLED. It is speculation that Samsung may use SLCD's on their Samsung Galaxy S4 this year, according to a recent article on GSMArena.
Click to expand...
Click to collapse
Id prefer sammy go back to LCD's and develop it further, AMOLED just has way to many uniformity issues for those who are not lucky. If sammy can produce a 'backlight bleeding free' SLCD then Im sold, as long as theres a way to increase the color saturation

Is s4 has this kind of issue too? Like mura effect..? I think s4 has too...
Sent from my GT-I9500 using xda app-developers app

Sorry for bumping this thread into 2014, speaking of the Note 4, Samsung seems to have done some interesting software mods, but the hardware is still relatively same behavior when you test the displays using Supercurio's app. It's gruesome to know, but I've been with the AMOELD family since 2011. Have you moved up to the Note 4, EarlZ?
EarlZ said:
Id prefer sammy go back to LCD's and develop it further, AMOLED just has way to many uniformity issues for those who are not lucky. If sammy can produce a 'backlight bleeding free' SLCD then Im sold, as long as theres a way to increase the color saturation
Click to expand...
Click to collapse

winlinmac001 said:
Sorry for bumping this thread into 2014, speaking of the Note 4, Samsung seems to have done some interesting software mods, but the hardware is still relatively same behavior when you test the displays using Supercurio's app. It's gruesome to know, but I've been with the AMOELD family since 2011. Have you moved up to the Note 4, EarlZ?
Click to expand...
Click to collapse
Nope, I did get the Note 3 for my 24 month contract. Same old issues exist black is still problematic (no more black crush though) as you can see white spots the screen if its not displaying something that is totally black.

These AMOLED panels are still in its infantile state, but more like it its pre-teen years undergoing puberty. I'd give it a couple more years for the technology to fully mature.
EarlZ said:
Nope, I did get the Note 3 for my 24 month contract. Same old issues exist black is still problematic (no more black crush though) as you can see white spots the screen if its not displaying something that is totally black.
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Samsung's "solution" to mura

SO ive figured this out a while back but never got the chance to post it.
If you put our note 2 beside a different galaxy series phone(anything older than s3) you'll notice that they display a darker black in a completely black environment, but our phone also has significant to no mura present.
This lead me to thinking, why wont our phone display black? It took a while but i realized that it isnt the oleds that are defective, but rather the TFT behind them cannot be 100% pure(meaning, it cannot be 100% of a certain material) and for that reason some of it could not operate under a certain voltage.
So how is samsung fixing this? Well, they make it so that in the darkest environments, the oleds always get a certain voltage, which results in black not being 100% black(still better than lcds, but we no longer get "infinite contrast"
just putting this out there, if anyone was ever curious.

Hmm very interesting indeed. I thought Note 2 had a different kind of Screen technology out of the whole galaxy series? Would that be a reason as well?

G1Master said:
Hmm very interesting indeed. I thought Note 2 had a different kind of Screen technology out of the whole galaxy series? Would that be a reason as well?
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well, the note 2 uses a new kind of pixel arrangement, so it is full RGB like the phones before nexus/s2, but that doesnt really have much to do with this...it's still based off TFT

winlinmac001 said:
Similarly explained in the following thread from last week,
http://forum.xda-developers.com/showthread.php?p=36908128
The AMOLED Displays use an "Active-Matrix" compared to standard OLED's in today's flag ship televisions which do not have an Active Matrix.
In AMOLED, as a result of continuous low voltage that is being fed into OLED via the TFT even in the lowest brightness, the blacks won't be necessarily black.
Every Note 2 has the Mura Effect like in previous Galaxy Devices. However, the manufacturing process has slightly improved, but not to the extent we all would like it to be.
Unfortunately, I don't consider our displays to feature local dimming, because individual pixels do not actually turn off. Blacks are not blacks, as a result of the varying voltage.
Although there are improvements to the AMOLED display as explained here,
http://www.ignisinnovation.com/technology/ignis-technology-overview/ignis-admo-p-technology
Unfortunately, even though the solution provided in the above link by ignisinnovation has been in the market for a couple of years already, Samsung does not employ these kind of standards, therefore every AMOLED display has the Mura effect but in varying degrees such as in the form of stains, lines, blobs, dots, and splothces. This can also affect the display output when it comes to uniformity because the TFT is solely responsible for the luminescence of individual sub-pixels on the OLED film.
You can also refer to this, http://www.freepatentsonline.com/y2010/0277400.html
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its not the manufacturing process that improved
thing is, when the material sint pure enough, some parts of the thin film transistor will not be able to transmit enough power, while others can
this results in some oled getting enough voltage to display say..gray while others display complete black
what happens is that sammy upped the voltages, so the black is now an uniform gray
edit: btw..there is no correction of aging for oled display
only compensation..and tbh witht he direction oleds are going its really not necessary...in the next 10years we should be able to print it off our printer..so it'll be pretty disposable

Quality has improved though.
Right, there is only compensation, slipped my mind, with the same article I posted above, the AMOLED displays are improved with compensation.
http://www.youtube.com/watch?v=ctA114zaY98
When I mentioned manufacturing, I meant that Samsung's method of making slightly better AMOLED displays has been accomplished by changing the voltage and better quality control handling.
The material has been slightly improved; the material used on today's AMOLED displays is purer than let's say the material that was used on the S2 and Note 1.
AznDud333 said:
its not the manufacturing process that improved
thing is, when the material sint pure enough, some parts of the thin film transistor will not be able to transmit enough power, while others can
this results in some oled getting enough voltage to display say..gray while others display complete black
what happens is that sammy upped the voltages, so the black is now an uniform gray
edit: btw..there is no correction of aging for oled display
only compensation..and tbh witht he direction oleds are going its really not necessary...in the next 10years we should be able to print it off our printer..so it'll be pretty disposable
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---------- Post added at 07:20 AM ---------- Previous post was at 07:10 AM ----------
Compesation for a Relaxed Area,
http://www.youtube.com/watch?v=tFgo6CIZgmo

[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.
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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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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.
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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.
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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.

Develop Bugs

welcome