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?
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 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
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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.
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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
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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..
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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.
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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
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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?
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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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Hello, I have trouble with my Nexus 7 2013. I have got new device a few days ago and I found dead/stuck pixel at the bottom left corner of my screen. For me it looks like dead/stuck pixel, but after several tests I am not sure.
I can see it only at max brightness (at lowest or medium it is almost invisible) and ONLY at black color.
If I will turn a little bit my device it changes color for green, red (at least I think it looks like red or green) etc.
I did several tests with that app: https://play.google.com/store/apps/details?id=com.htc.chris.blackspotdetect
And I cannot see that pixel in any of those colors built-in app, except on black color (it is clearly visible on black background).
My question is: is it dead or stuck or anything yet pixel?
Thanks for any help,
best regards
vBB said:
Hello, I have trouble with my Nexus 7 2013. I have got new device a few days ago and I found dead/stuck pixel at the bottom left corner of my screen. For me it looks like dead/stuck pixel, but after several tests I am not sure.
I can see it only at max brightness (at lowest or medium it is almost invisible) and ONLY at black color.
If I will turn a little bit my device it changes color for green, red (at least I think it looks like red or green) etc.
I did several tests with that app: https://play.google.com/store/apps/details?id=com.htc.chris.blackspotdetect
And I cannot see that pixel in any of those colors built-in app, except on black color (it is clearly visible on black background).
My question is: is it dead or stuck or anything yet pixel?
Thanks for any help,
best regards
Click to expand...
Click to collapse
it could be a dead pixel, but my advice is to return and get it replaced while you can because later it may be half of your screen or worse!
And I will Thanks for pushing my mind forward, I was afraid of sending it for warranty, but I have no choice.
Isn't there a number of dead pixels there has to be before you can send it to warranty/exchange it?
Just purchased a new s9 regula version in Canada with the snapdragon 845. I realized on white pages the color shift significantly when I am viewing from the side. Kinda similar to the pixel 2 xl problem. Anyone having same issues as well ?
I am.
I know this is about the S9, but the S9+ is suffering from the same problem. IMO the current batch of S9+'s [Tested 5 today] have a +2,100K color shift when you get 30 degrees off angle.
My Galaxy S8+ has no such color shift.
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I believe it has to do with the shape and angle of the pixels; also remember they don't have the same amount of sub-pixels for R,G,B.
OR
A red tinted coating under the glass/somewhere in the display stack that:
1) Gives the display a higher contrast
2) Makes the screen look darker when off
3) Makes display calibration easier because they don't need to take away as much blue to hit their D65-ish target
And compound to that the display is calibrated at 0°, so you go from around 6800K to 8800K (i.e. way more blue) really fast.
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OR they recalled all the other displays they were using because of the digitizer issues and we're now stuck with inferior panels for awhile? A temporary supply chain change? Honestly I'm just making educated guesses here.
Samsung is being cheap or stupid. The Galaxy S8's screen is miles better with color shifts ..it basically has none. My S8 screen looks like a sticker, it is beautiful. The S9's on the other hand looks like a OK OLED display.
Attached below are measures in AMOLED Cinema mode with a white background going from 0° to 30° (dE is CIE2000, D65). -- Each picture is a different S9+.
Yellow is Luminance in cd/m2
RGB is how far in percent Red/Green/Blue are away from D65
Purple is CIEDE2000 (anything under 3 is a ok, anything under 1 is perfect)
Cyan is color temperature in Kelven (the higher the number the bluer the image).
Does it affect your user experience?
Did you solve this issue with blue tint?
https://www.notebookcheck.net/Samsu...readed-green-tint-display-issue.489618.0.html
BUMP
What I'm noticing when watching videos is that blacks look grey. I don't see green though.
Beggining to love my ? display on the S7 more and more.
Perfect size and performance is really good next to my S20 Ultra (Exynos).
vangry2020 said:
What I'm noticing when watching videos is that blacks look grey. I don't see green though.
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if you're using the S7 vs the S7+ then it's not surprising, LCDs do not produce blacks like AMOLED.
Superb screen display on Tab S7 using since 2 Months. i have no issues of colors nor any degradation of screen. Being an Amoled fan . I love the perfect blacks on my Old Tab S5E although more.
lot of negative Paid marketing is done against top companies before launch of a flagship device by Rival companies
So I noticed this same green tint issue. Great on the left side and it fades into a greenish tint. I assumed it was the screen but I was playing around with it and it doesn't seem to consistently appear. If I load up the play store, at lower brightness, I see it. When I open the settings menu for the tablet, same grey background and the greenish tint isn't there. The brightness hasn't changed either. I started looking at other grey screens and I see the same thing. I'm not saying it's not an issue but I would think it would be fairly consistent across grey backgrounds at the same brightness. I see it in dark mode in Google apps but not is Samsung apps or even Nova launcher settings. Weird..
I greys are a slightly different shade but the same brightness. The playstore you can see on the right side. Nova settings and one of my live wallpapers settings are both grey and no greenish tint.
Anyone else notice this?
gottahavit said:
if you're using the S7 vs the S7+ then it's not surprising, LCDs do not produce blacks like AMOLED.
Click to expand...
Click to collapse
Also, enabling the "blue light filter" severely degrades the black level. I understand it's useful for those who experience eyestrain reading white text on a perfectly black background, hopefully either Samsung or a community member can change it for those who prefer the best blacks while still attenuating the blue colors.
Hello!
I got mine a few days ago and first thing I noticed was a color tint on grey goint to green or yellow, especially on the lower brightness levels. Especially compared with my older Samsung Galaxy Note 10.1 (2014) also black ist something like anthracite, but not deep black.
So I downloaded a display test app from Playstore Display Tester, and guess what! Black is really dark black, white is bright white and grey is looking much better with almost no color tint.
Could soomebody else check it?
Btw.: Firmware is T870XXU2BUD2 (Android 11).