Samsung's "solution" to mura - T-Mobile Samsung Galaxy Note II

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?
Click to expand...
Click to collapse
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

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.

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
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
---------- 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

Related

Color production on SAMOLED screens [SAMOLED vs (s)LCD]

Many people believe that SAMOLED screens on Samsung devices are far superior in every way to other devices. Recently with the addition of all these new and similarly spec'd WP7 phones, it seems like a big deciding factor is the screen display.
I have used a focus and a htc surround for a week in addition to my iphone 4. Watching avatar on both devices, I realize that both screens have their setbacks, thats right even the AMOLED!
The general consensus with htc devices is that the viewing angles are terrible. Check out any video review of a HD7 or Surround and you can see that the screens are extremely washed out when viewed at an angle, and unfortunately, many of these reviewers shoot their videos not head on for obvious viewing reasons.
But when viewed normally, the wp7 htc devices are definitely not as awful as at an angle. Still, it is nowhere near SAMOLED crispness or vibrancy. One thing I did notice, however, is that when watching the same video or viewing the same webpages on my iphone 4, I can rightfully say that the lcd screens from htc are just as good as the overly praised retina display. The differences of colors and sharpness between the two are too subtle to tell.
The SAMOLED screens "pop" in color and vibrancy. Whites are glowing white and blacks are dead on black. No one can say that the Samsung did a bad job on their new screens. However, one thing that people tend to misjudge is the color production on their devices like the focus or omnia 7. It seems that while the surround may not produce white and dark as vibrantly, the ACTUAL colors (red, blue, green) are pretty close to what they should appear. What I am saying is the SAMOLED screens are TOO SATURATED. Again this could all be subjective, but I find that the SAMOLED screen just goes for as vibrant and colorful as they can get, disregarding true color tones. For instance, skin in pictures looks intensely orange and I have never seen skies so blue in real life. Webpage colors can be a bit to contrasting as well. And my opinion is from comparing the SAMOLED to my macbook pro LED screen.
I watched avatar on my blu ray and compared it to the surround and the focus. unfornately to say, the focus just makes the navis look almost syrup-y bubblegum blue. The high contrast of samsung screens are good in some ways but in others, it just seems overdone.
HTC may have made their screens to warm in color, thus appearing a bit washed out when comparing to other wp7 devices. But the AMOLED screen seems too saturated in color production, not just compared to my surround, but also my macbook's screen as well as my LED tv.
So in the end which would you pick? What are your guy's thoughts?
I've never done that kind of testing but my captivate has an awesome screen and I would put it against any other screen. The ritna screen isn't as impressive as apple makes it out to be. At least for me. But I will say these are the best out of all of them. My friend just picked up the x10 and boy does the screen look like $h!#, next to mine.
Sent from my cogcap
I 100% agree with you, infact I have had alot of iphone 4 users comment on how good the screen is on the HD7 which shows what a difference using the phone in a normal way makes when compare to viewing at some obsure angle.
I also have always though the colours look wrong on OLED screens, but having said that, I have always though that about samsungs HDTVs, they seem to over exagerate all the colours and sharpness to make you initially go "WOW", then when you think about it, they just look wrong.
Personally, im happy with my HD7 LCD, and would take SLCD over OLED at the moment.
The over-the-top vibrance is a reason why I went SLCD.
That and the Pentile pattern. My eyes are still well enough to notice fringing on rendered text as well as the pattern generally on evenly lit surfaces.
I had a Nexus One, the OMG-in-your-face colors get old quickly.
thanks for input, the captivate looks amazing running android and playing videos I agree.
But do you think there is a line between displaying vibrancy vs true colors?
Sometimes when I view images in the focus, it feels like I opened a photo in Lightroom or Photoshop and just cranked up the vibrancy settings to the max, resulting in some drastic color contrasts.
But then again, the LCD screens of HTC do seem last generation. If only they could meet in the middle.
@ Tom Servo, I actually think the Nexus One did a good job on their screens. They use regualr AMOLED screens just like the Zune HD from microsoft.
Color production was beautiful. Only complaint with those screens are that they practically turn invisible in sunlight haha.
For me, WindowsPhone7 is all about white letters on black background and some coloured squares in between.
I do not watch videos on the phone and I don't have much photos to display.
So I chose the Omnia7 with that gorgeous SAMOLED screen because it's superior for my use.
SAMLOED ftw. IPSLCD (retina display) is old, Apple just upped the pixel count. Put that many pixels in a SLCD and would look gorgeous.
Take a peek at this article, it has all you need to know:
displaymate.com/Galaxy_S_ShootOut.htm
Scroll down to section 8: Gamut.
You'll see that the SAMOLED is way over-saturated and that the
iPhone4 is very washed-out.
I own a Focus and a Droid, as well as an e-IPS and s-IPS panels, and I can
tell you that the article is spot on. Colors on the Focus are like crayola simple.
If you want accurate colors, then go somewhere else, but if you want the
"wow factor" then go SAMOLED hands down.
Hope that helps.
mrroey said:
@ Tom Servo, I actually think the Nexus One did a good job on their screens. They use regualr AMOLED screens just like the Zune HD from microsoft.
Color production was beautiful. Only complaint with those screens are that they practically turn invisible in sunlight haha.
Click to expand...
Click to collapse
I went from Nexus to Trophy. Looking at the same pictures, I actually preferred SLCD. That and as I said, some people notice the Pentile pattern. Which also makes text fuzzier. With Metro being pretty sparse in busy textures and mostly text based, I think it makes more sense to use the display technology that has full resolution on all color channels. AMOLED has currently half the horizontal resolution on the red and blue channels.
In relation to Samsung devices, it's possible they're running their Digital Natural Imagine Engine in background. I haven't had a direct Samsung device with AMOLED, so I can't say.
Oranjoose said:
Take a peek at this article, it has all you need to know:
displaymate.com/Galaxy_S_ShootOut.htm
Scroll down to section 8: Gamut.
You'll see that the SAMOLED is way over-saturated and that the
iPhone4 is very washed-out.
I own a Focus and a Droid, as well as an e-IPS and s-IPS panels, and I can
tell you that the article is spot on. Colors on the Focus are like crayola simple.
If you want accurate colors, then go somewhere else, but if you want the
"wow factor" then go SAMOLED hands down.
Hope that helps.
Click to expand...
Click to collapse
That was a GREAT article and very informative, though it can get a bit technical at times. To quote some interesting conclusions from the articles...(NOTE THAT THIS ARTICLE WAS WRITTEN PRIOR TO WP7 PHONE RELEASE)
"We compared the Galaxy S side-by-side to a calibrated Professional Sony High Definition Studio Monitor using a large set of DisplayMate Calibration and Test Photographs. All of the photos on the Galaxy S had too much color saturation, to the point of appearing gaudy, particularly faces and well known objects such as fruits, vegetables, flowers, grass, even a Coca-Cola can. Photos that include very color saturated objects, such as a fire engine, were in some cases painful to look at. These effects are similar to setting an HDTV to a Vivid picture mode and then turning up the Color and Sharpness Controls. The punchy and excessively vibrant looking images on the Galaxy S may initially get lots of oohs and aahs, like in many of the early reviews, but after a while the gaudy looking images will become tiresome and unpleasant."
"There is no decisive winner as each of the three “Super” displays significantly outperforms the others in more than one important area and significantly underperforms in other areas. The iPhone 4 by far has the brightest and sharpest display and is the most power efficient of the displays. The Motorola Droid by far has the best picture quality and accuracy. The Samsung Galaxy S by far has the lowest screen reflectance and largest Contrast for both bright and dark ambient lighting, and the best viewing angles. On the flip side, the iPhone 4 has a weak color gamut and viewing angles, the Motorola Droid has weak screen reflectance and viewing angles, and the Samsung Galaxy S has lower brightness, excessive color saturation, higher power consumption and some sharpness issues. "
so there you have it. according to Displaymate,
iphone 4 = best mobile display
motorola droid (surprisingly) = best mobile picture quality
Samsung vibrant = best mobile display technology
Samsung is notorious for producing display panels with oversaturated color pallet.
It is true for their Plasma, LCD, LED's on the consumer grade television sets and now SAMOLED displays on the mobile devices.
the oversaturation of the AMOLED's have been well documented prior to now. it doens't seem to be a problem for many as everyone has different interpretation of colors in their own eyes anyway.
I just think when u put these phone side by side...and contrast and vibrance of the samsung phones is just ridiculous...true color representation kinda falls to the side
The Retna screen is very impressive because the pixel density is much higher than on other screens. That makes reading on the screen MUCH easier on the eyes than on other screens. You may not consciously know it, but eye fatigue does happen and it's a huge consideration when buying a device you will spend so much time looking at. It also means the text will look much better when/if you zoom in on it.
It's like comparing a crappy CRT monitor to a high class LCD.
The color reproduction on sAMOLED is nice.
However, there's more to a phone than the screen.
HD7 has more RAM than other WP7 devices. It has a bigger screen than other WP7 devices. It has more storage than many other WP7 devices.
The only major downside to that phone, IMO, is small battery and the fact that the screen is flush with the front of the phone. Unlike something like a Vibrant, if you drop an HD2 or HD7 on its face it can destroy your screen.
Of course, that can be somewhat fixed with a case... Some people don't like cases, though...
I like the SAMOLED screens, but when I looked at the HD7 it was better than I thought it would be. That being said I do still want the SAMOLED. The other factors leaning me toward the focus (or samsung in general) are the fact that the screen has gorilla glass, making it much less likely to be scratched and when I was playing with the Focus and the Quantum/Surround/HD7 the screen on the Focus also seemed much more sensitive and responsive compared to the others.
Omega Ra said:
...the screen on the Focus also seemed much more sensitive and responsive compared to the others.
Click to expand...
Click to collapse
This might have to do with the fact Samsung places the SAMOLED display directly beneath the capacitive screen. Other phones have a much larger space between the two.
The result is Samsung phones are often thinner, and they appear to be more accurate and responsive.
i put my omnia 7 up against a hd7 in the flesh ( metal/plastic) and there is no comparison. Theres just no going back to LCD now. and as for viewing angles, seriously?, viewing angles on a mobile phone? are you kidding me? no one holds their phone at an angle! its not like we are going to mount our phones onto walls and have 10 people gathered around to watch it.
Since having my desire with amoled display for about half a year I won't go back to lcd/slcd because I think the colors are far more superior at least to me.
I went for the Omnia 7 as business device and I couldn't be happier. Build quality is surprisingly very good, perfect screen size for my needs and all in all I'm glad that I didn't choose the HD7 imho.
Regards
It may not be the sharpest of display and not produce the most accurate colour and I wasn't particularly impressed with Galaxy S S-AMOLED screen on android!
However IMHO S-AMOLED looks stunning on WP7 OS, it really compliments the Metro-UI and when put side by side with S-LCD running the same OS it's just not the same! It's for this very reason that I went for Omnia 7 over HD7.
lqaddict said:
Samsung is notorious for producing display panels with oversaturated color pallet.
It is true for their Plasma, LCD, LED's on the consumer grade television sets and now SAMOLED displays on the mobile devices.
Click to expand...
Click to collapse
Samsung plasma and in general any plasma is not as oversaturated as other technologies. LCD and LED displays from all manufacturers are setup to be in the "torch" mode (sometimes called dynamic by the manufacturers) to stand out on the floor. And to compensate for the grayish black level they oversaturate the color.
After you calibrate though, they all look the same, almost. LEDs will have a bit of blooming, LCDs will not be as black as plasmas and plasmas will lack the brightness in case you want to watch in a sunlit room.
The iPhone 4's screen looks pretty good, but 3.5 inches? Ugh.

[Q] Screen Burn-In Questions

I have an Epic 4g Touch (SGSII), and am wondering about screen burn-in.
I already know it's possible to burn-in our Super AMOLED+ screens, but I'm wondering what kind of things I can do to prevent it, and if doing certain things will accelerate the burn-in or not.
1. I'm mostly indoors, so I always keep the brightness set to 30%. This should be sufficiently low to slow the burn-in, correct?
2. I use ADW Launcher Pro, but I don't have it auto-hiding the notification bar. My screen is on between 1-3 hours per day. Should I be using the auto-hide feature?
3. I was thinking about using the clock in dock mode at night while I charge my phone. I set the brightness to the lowest possible setting, and I know that after a few minutes, the phone sets a black background with the clock text being yellow and moving around the screen every minute or so. With all of that in mind, is that going to be bad for the burn-in?
4. This is kind of related to #3. If a pixel is pure black, is it susceptible to burn-in?
Thanks in advance to all replies. I'm pretty tech savvy, but kind of a noob when it comes to these advanced screen questions.
Awesome, thanks. Wasn't aware of that strobe trick; I'll have to start doing that
newalker91 said:
My suggestion to reduce any and all burn-in is the same trick used to fix stuck pixels on LCD screens. Download a strobe light application that uses multiple colors, and once every couple of weeks allow your phone to sit while your screen rapidly flickers through all of the colors for about 10-15 minutes. This will wash away any burn-in that may be building.
Click to expand...
Click to collapse
I just had a thought...
Isn't burn-in caused by pixels becoming physically damaged? So how can a strobe light app that uses these damaged pixels "wash away" burn-in?
Not trying to be rude or anything; I definitely appreciate everyone's knowledge on this subject. I guess I'm just looking for more information.
personally i wouldn't worry too much about burn in. things move around enough on these phones to mostly prevent it.
and for what it's worth i still use my original samsung launch day moment as a clock for the last year or so and have yet to notice any burn in at all (and that clock doesn't bounce around) sometimes during the day i still use it as a media player or terminal device too. screen still looks awesome (not compared to the gsii but)
granted the moment was super amoled not super amoled+ but heh....
newalker91 said:
No, the Samsung Moment was sure not Super AMOLED. It was LCD. I've taken probably a thousand of them apart.
Click to expand...
Click to collapse
you sure? the og box i have on my shelf def says amoled.
EDIT. ok maybe its not SUPER AMOLED. But it def is AMOLED.
"3.2-inch AMOLED display"
newalker91 said:
Regular AMOLED displays are basically the same as LCD screens. They function completely different than Super AMOLED.
Click to expand...
Click to collapse
the only difference between amoled and super amoled is the PenTile RGBG pixel matrix is replaced with a common RGB subpixels arrangement, going from eight to twelve subpixels in a group, resulting in finer details. The screen technology is also brighter, thinner and 18% more energy efficient. super amoled+ adds more of the same just brighter lighter and less power hungry.
yes any led panel (amoled and super amoled) is just an led panel thats true.
its the material used for the led catalyst (organic) and position of the film in the glass (under not over) that differentiate them.
but then again it's really not an issue. and i could be wrong.
all i know is that my moment has been left on in situations that i know would cause burn in on any normal lcd style device and has never been an issue.
for the length of time that most people keep a phone (2years or so) i personally wouldn't worry about it.
that being said OLED pixels degrade with use (become dimmer, and the different colour pixels degrade at different rates), but according to most screen datasheets ive seen we are talking 15-20,000 hours of screen on use for a noticeable difference.
just ask yourself this do you ever see screen burn in on display phones that are left running screen on all day?
but didn't mean to push the thread offtopic
I have seen burn in on my Captivate, so yes it will happen.
yep it will happen in certain circumstances i just went looking through my old amoled info and found this link
http://data.4dsystems.com.au/downloads/micro-OLED/Docs/4D_AMOLED_Presentation.pdf
this has a lot of good info but is out of date.
what we get isn't true burn in (although the outcome is similar)
what we see as burn in is really the degradation of pixel intensity and has alot to do with the colors the screen must display. so even a moving clock is degrading the pixels just that it's degrading them (hopefully evenly across the screen) the super amoled+ screens seem to have added a white led to the mix to help prevent burn in from white screens/txt and lower power consumption.
it also appears some colors are better for screen life than others with blue having the shortest life.
keep in mind if your interested in looking at the link that it is describing the first gen amoled screen and much has been improved since then.
from this i would also make the assumption that flashing the screen doesn't unstick any pixels it just burns them all out a bit.
i'll shut up now
Well I've done some more research too, and found that what mjcollum said is pretty much the case for us. We don't actually get a "burn-in", but rather the pixels degrade and leave a sort of "ghost" image where the degradation is worse than surrounding areas.
The "half life" of older AMOLED pixels was 14k hours, but most articles I've encountered mention that technology has improved, ergo the pixels should last a bit longer in our Super AMOLED+ displays.
But still, there will definitely be some degree of degradation. I suppose it's a lot like sex; leaving the screen off will keep your pixels the safest, but it's a lot more fun to use what you've got
I only wonder if a dim display degrades slower than a brighter display... ?
interesting. good to know.
does this apply to qhd displays like the photon also? or is this only a amoled thing?
newalker91 said:
Regular AMOLED displays are basically the same as LCD screens. They function completely different than Super AMOLED.
Click to expand...
Click to collapse
The moment was AMOLED... it had a seperate digitizer.
The Galaxy S was Super AMOLED it incorporated the digitizer with the pentile matrix.
The Galaxy S II is Super AMOLED+ which replaces the pentile layot with the standard RGB grid.
To prevent burn in limit screen on time, no need to do any crazy pixel unsticking tricks as it'll just reduce the vibrancy of your screen.
thanks warlord good to know.
one thing to think about is even if the pixel halflife is only still 14k hours
365(days) x 24(hours) = 8,7650 hours if you left it on for a full year.
so i say just use the thing.
---------- Post added at 10:19 PM ---------- Previous post was at 10:13 PM ----------
SpaceMonky said:
interesting. good to know.
does this apply to qhd displays like the photon also? or is this only a amoled thing?
Click to expand...
Click to collapse
i could be wrong but i believe the qhd part just references the resolution.
and the photon has a normal style lcd display. so if it got burn in at all it would be the normal lcd style.
mjcollum said:
i could be wrong but i believe the qhd part just references the resolution.
and the photon has a normal style lcd display. so if it got burn in at all it would be the normal lcd style.
Click to expand...
Click to collapse
You're correct, qHD only references the resolution, not the display type. Which is funny, because a lot of Google searches are for "qHD vs Super AMOLED+". I think people are just trying to pit their Droid Bionics against our SGSIIs

AMOLED blotches/lines ANSWER

Hey guys,
I have a Nokia N9 (which uses an SAMOLED display made by samsung), and there have been some users reporting blotches/lines on their screens when in a pitch black room. I found this forum whilst conducting some research, and signed up after finally discovering what the problem actually is
It seems to be with the technology Samsung is using. According to this website, what you are experiencing is called 'mura'.... lines/spots as a result of an uneven current distribution to the OLEDs.....
Unfortunately as i am a new member, i can't post a link to the website.... but essentially, this company offers a technology that makes sure the mura never appear..... If only Samsung used it!!!!
AMOLED displays have two main layers:
An OLED (organic light-emitting diode) layer that emits light.
A backplane, made of TFT (thin-film transistor) circuits that provide current to the OLEDs, thereby controlling their brightness.
Polysilicon backplanes don’t provide uniform current because of manufacturing non-uniformities. Without IGNIS technology, the TFT circuits will provide different current to the OLEDs, which results in lines, spots, and cloudy areas known as “mura”.
IGNIS AdMo-p™ technology uses a patented TFT pixel circuit and driving scheme to compensate for the non-uniform backplane. So the TFT circuits always provide uniform current to the OLEDs, even though the TFTs themselves aren’t uniform. This means the AMOLED display will always show smooth, mura-free images.
Hopefully this gives everyone a bit of closure; I guess it's a case of finding a phone that has the mura to a lesser extent!
Thanks. Good info. Pls type the link so i can cut and paste into my browser
Sent from my SGH-T989 using xda premium

Mura Effect & AMOLED Displays (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.

Mura Effect & AMOLED Displays (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?
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
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.
Click to expand...
Click to collapse

Categories

Resources