Develop Bugs

Why my AMOLED has pinkish tint (Answer inside) - UPDATED

Hi,
Ok first of all i know that there are other threads related to this thing, those threads defined the problem and many posts were speculations and wondering wither its hardware/software/glitch .... etc
As i was searching about this and saw the other members conclusions I wanted to start a new thread so any new member comes and read this and know exactly why is this happening to him/her, and wither its a real problem or not.
Desire's AMOLED displays have a big resolution 480*800 pixels,and have different sub-pixels arrangement in it, each pixel have "RedGreen" and the one after it is "BlueGreen" .... RG BG RG BG, .. etc, that is PenTile Matrix, while other LCD and "normal" displays have RGB RGB RGB, ... etc
for more info about this, click here
the pentile matrix looks exactly like this
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Now the effect of this matrix is double edged, instead of having 3 sub-pixels in each pixel, we have 2 sub-pixels in each pixel, this saves power, precious battery power, but also this arrangement of sub pixels contributes to the issue somehow because the colors will not "look" exactly the way they are (the way the RGB matrix show it, which is used in most of our displays like TV, PC, LAPTOP, ... etc), there will be slight difference due to the screen "approximation", and that difference is NOT noticeable in most cases, only in few cases where the solid colors intersects with each other.
see the posted screenshot of Gmail app with the gradient color near it
see how the color picker identified the gray color, .. and how close it is to the pink, the pink showed due to the display approximation of the color.
and most importantly see how "photohop" saw the color as "not a web safe color" and see how it showed in the small square the pink color!
photoshop detects this because it knows that if an "approximation" happens than this will be displayed as pink.
And not only that, photoshop suggests that you put a "safe" color, and it shows "pink" instead of the gray as a suggestion!! why is that?
To find the answer, look at the circle in the color gradient board, you will see that this "gray" is nearer to the pink than it is to the actual gray!!!
and here we are seeing it pink on the Desire's AMOLED devices, what a surprise!
Now notice how the upper bar is dead gray, and does not have any pink in it, that is because its "GRAY" is not close or near any other visually-different color. and of course photoshop identified it as "SAFE for web", and that even if an approximation happens, this will still be rendered as gray
the good news is, it will NOT be noticeable in most of the cases, because most of the colors are not gray scaled and not "visually close to the human eye" to other colors, as you can see from the gradient color posted there are many "safe" grays out there, ... but google had to choose that gray that is near the pink
Now the bad news is, that this is NOT an android software problem, it is a hardware (display/calibration) issue.
but does that mean it cannot be solved "indirectly" by software? .... not sure, am thinking of what if Android created a layer where it picks each color and see wither its safe or not, .. if its not safe than do an OS approximation for that color, if its "gray near pink" change it to "gray" and pass it to the AMOLED as "safe color". not sure how that would be implemented or what is the weight and impact.
but as i mentioned before, if apps stick to "safe" colors, this will insure that even if an approximation happened, nothing will be noticeable
------------
UPDATE For people who think that the issue is from the browser and not from the AMOLED display that has PenTile matrix.
here is a screenshot from Android SDK emulator with the same browser as in Desire (WebKit)
here is a screen shot of the original website from the PC, using Google Chrome browser
and here is a screenshot of the site taken directly from HTC Desire (the site has been visited from the HTC Desire and a screenshot was taken and transfered)
Its pretty clear that the browser is not the real issue (even though it has some slight very slight pinkish hue), the pinkish is alot worst in the desire than what is the emulator and the screenshots show
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UPDATE
After seeing the below pictures (thanx onkolog for posting those pics!), one can conclude that this "gray shades to strong pinkishness" issue is definitly not a general AMOLED issue.
People reported that in Samsung Galaxy, and Legend (Both AMOLED but not PenTile matrix) have slight pink viewing the htc.com site, but it is nowhere as pink as found in the HTC Desire
HTC Desire:
HTC Legend
as the pictures shows clearly that the legend (which has AMOLED display with normal RGB implementation) shows the Gray as pretty Gray (not as pink as the Desire).
here is a pic of the Desire & Legend side-by-side with the HTC website shown
(thank you ohyeahar for this shoot). the Desire has more pinkishness than the legend, the legend seems fine but some people said that it also has some slight pink (not as desire though)
as you can from the photo and as ohyeahar stated (having both devices, legend and desire) that its not a real issue, but its there if you really look for troubles you will find it, otherwise normally you wouldnt be annoyed from it
EDIT: some people have pink hue all over the screen, not only particular apps/colors, .. IMO this just your device, and you should replace your device
EDIT: I used web-safe colours as a technique to show how the colours might look different due to screen approximation the web-safe colours is not designed to detect the approximation of the Desire's AMOLED accurately, it is designed for web approximation due to compression, but they are similar some how, in terms of that colours are getting approximated and changed sometimes to the nearest possible colour thats why i used it.
the "web-safe" approximation only appears when an image is compressed for web standards (or approximated in case of the Desire's AMOLED), .. some images are not compressed for web use, you see the the HTC.com page gray on your monitor, and i see it gray on my nokia e75, but it looks pink in the Desire's AMOLED because the display of the desire (and i suspect android too) approximate the colour, and i used the web-safe colour technique to detect that (even though that this technique is not dedicated to identify the Desire's AMOLED approximation)

Thanks irkan for that. That goes a long way to explaining why we're getting this pink tint in the same screen when we can also see pure grey.
So, now, what can I/we do ... should we replace our Desires for new ones or not? I suppose there is no harm, just the inconvenience of setting it up again ...

khyasad said:
Thanks irkan for that. That goes a long way to explaining why we're getting this pink tint in the same screen when we can also see pure grey.
So, now, what can I/we do ... should we replace our Desires for new ones or not? I suppose there is no harm, just the inconvenience of setting it up again ...
Click to expand...
Click to collapse
as i mentioned in the last line, if you see those damn pink tints every where, than most probably your device is faulty, but if you only see them in GMail app and some few other occasions, than its just the display.
but you know what, if you still feel unsatisfied just go and replace it, setting up a new phone is a pleasure with the desire

It is quite disappointed ... I meant, the AMOLED and Pentile Matrix are suppose to improve battery life, but in fact the HTC Desire battery life is not that good.
Sure, it is not terrible. However, it is not satisfactory when you read from users testimony here:
http://forum.xda-developers.com/showthread.php?t=653496
And I hate seeing that pinkish color
Oh well, my first Android device ...

The battery drain from the screen is somewhat dependant on what you are watching. If you are displaying an image with lots of different colors, areas with black and so on, the screen will not use as much power as an LCD-screen. But if you for instance use a spreadsheat in excel or word-doc. where most of the screen is bright white, then the screen will use more power than an LCD, since it has to light up all pixels, whereas the LCD only has a few backlights.
As an exampel from a QVGA screen; black text on a white background would eat up 3W, white text on a black background would only use 0,7W.
So in real life, there might not be that much gain in powersaving.

Given that the HD2 has a 12% smaller battery and 35% more screen area than the Desire but similar battery life, I don't understand why the Desire needs an AMOLED screen that can't accurately reproduce some colours and doesn't have a true 800 x 480 resolution (more like 392*653 if you read the article linked in the first post).

seriously am i the only one that doesnt see a big difference here? i can hardly see the pink tinting. maybe if i look dead close to it i may see it but as long as its not soo obvious i wont be replacing my device.
nip picking springs to mind but anyways OP thanks for the information though.

I've just canceled my pre-order, no way I'm getting a device with a screen that distorts the colors.
This reminded me of the nexus one screen analysis made by Display Mate.

jonneymendoza said:
seriously am i the only one that doesnt see a big difference here? i can hardly see the pink tinting. maybe if i look dead close to it i may see it but as long as its not soo obvious i wont be replacing my device.
nip picking springs to mind but anyways OP thanks for the information though.
Click to expand...
Click to collapse
Have you tried visiting for example the htc.com homepage. As said in another post it looks like a totally different site.. Everything on it is pretty much pink! lol.

Coatezy said:
Have you tried visiting for example the htc.com homepage. As said in another post it looks like a totally different site.. Everything on it is pretty much pink! lol.
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Click to collapse
Yes i tried and it looks better on my desire actually. the colours are more warmer and sharper then on my TN dell pc monitor.
it is a tiny bit pink on the desire but its hard to tell because generaly TN panels are NOT accurate reproduction of the true colours.
matter of fact, OP did you try viewing that screen shot on a IPS panel monitor?
You guys do know TN panels do not reproduce accurate colours right lads? compare it to a ips panel and i bet you it is the same colour reproduction as the desire.
before slagging off the desire for having tinting issues, check it first. go to a apple store and use there mac to browse the htc website and see for yourselfs

Not slagging off.. Just want to make sure it is correct before I except it.. When i say it is pink i mean not far off the pink of this smilie . It isnt a faint pink which you can just pick out... It is pink.

Coatezy said:
Not slagging off.. Just want to make sure it is correct before I except it.. When i say it is pink i mean not far off the pink of this smilie . It isnt a faint pink which you can just pick out... It is pink.
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Mine too :-( Literally only unboxed the phone 10min ago...gutted.

setspeed said:
Mine too :-( Literally only unboxed the phone 10min ago...gutted.
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Click to collapse
that sucks man mine will be delivered soonish and im scared now

agreed, if mine is not as good as it looks in this video, I'm going to return it until it is!
youtube.com/watch?v=t-TYfKiXXFE

I think everyone in the world who have htc AMOLED screen suffers a slight pink tint on the Gmail application, ... I think that is due to the AMOLED and there is nothing can be done about it, .... BUT i saw some people complaining about alot more, and not only a slight pink, a strong pink, ... so that is a problem of the device and you should ask for another device!!

irkan said:
I think everyone in the world who have htc AMOLED screen suffers a slight pink tint on the Gmail application, ... I think that is due to the AMOLED and there is nothing can be done about it, .... BUT i saw some people complaining about alot more, and not only a slight pink, a strong pink, ... so that is a problem of the device and you should ask for another device!!
Click to expand...
Click to collapse
Is there anyone who DOESN'T have this pink tint to certain light grey colours?

setspeed said:
Is there anyone who DOESN'T have this pink tint to certain light grey colours?
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Click to collapse
right now i think everyone have it, .. some people just dont notice it much.
what i like to see is, ... real UNLOCKED ROM version, to confirm once and for all that this slight tint is indeed an AMOLED issue not specific device/ROM issue!
but i guess we will just have to wait to confirm this, unlocked versions are due in few days

irkan said:
right now i think everyone have it, .. some people just dont notice it much.
what i like to see is, ... real UNLOCKED ROM version, to confirm once and for all that this slight tint is indeed an AMOLED issue not specific device/ROM issue!
but i guess we will just have to wait to confirm this, unlocked versions are due in few days
Click to expand...
Click to collapse
i am wondering if the official version will have the battery improved cuz i cant understand how come the guy from the review had his phone up and running for 2 days

cez10 said:
i am wondering if the official version will have the battery improved cuz i cant understand how come the guy from the review had his phone up and running for 2 days and his batter is at 50% lol
Click to expand...
Click to collapse
2 days? ... check this guy out http://www.youtube.com/watch?v=ghRFtDD4t9M
he says he managed to squeeze 4 (FOUR) days out of this sucker

gogol said:
It is quite disappointed ... I meant, the AMOLED and Pentile Matrix are suppose to improve battery life, but in fact the HTC Desire battery life is not that good.
Sure, it is not terrible. However, it is not satisfactory when you read from users testimony here:
http://forum.xda-developers.com/showthread.php?t=653496
And I hate seeing that pinkish color
Oh well, my first Android device ...
Click to expand...
Click to collapse
yes it does, ... if you had TFT screen instead of AMOLED the battery life would have been ALOT worst!
and all those people you are talking about had their handsets for less than a week, ... they have to play with it every god damn minute because its a new toy, .. after the novelty effects wears out, .... am sure the Desire will last more than one day easily ..

Note II screen partially tinted

Hello everyone. Right below the notification bar, there is a tinted area going sideways. This appeared about a week ago. Only the display is affected, this doesn't appear in screen shots. When I get the device in landscape mode, the tinted area stays physically over the same pixels, so it's now upside down. I took pics of the phone by another phone. The quality is not so good but sharp eyes will notice it. Anyone had the same problem? Any ideas what should I do about this?
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The first two are screenshots and in the last pic you can see bottom half of the username box is a darker tone.

Dr Fretless said:
Hello everyone. Right below the notification bar, there is a tinted area going sideways. This appeared about a week ago. Only the display is affected, this doesn't appear in screen shots. When I get the device in landscape mode, the tinted area stays physically over the same pixels, so it's now upside down. I took pics of the phone by another phone. The quality is not so good but sharp eyes will notice it. Anyone had the same problem? Any ideas what should I do about this?
The first two are screenshots and in the last pic you can see bottom half of the username box is a darker tone.
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Hi! It's probably screen burn in, common with amoled displays, I had it quite bad on my old phone. Caused by spending a lot of time on the messaging app, in which the part below the notification bar was grey, and the rest white. Brighter sections of the screen age faster.
I assume you use your phone in portrait mode a majority of the time?

csmiler said:
Hi! It's probably screen burn in, common with amoled displays, I had it quite bad on my old phone. Caused by spending a lot of time on the messaging app, in which the part below the notification bar was grey, and the rest white. Brighter sections of the screen age faster.
I assume you use your phone in portrait mode a majority of the time?
Click to expand...
Click to collapse
I spend much time on tapatalk and yes in portrait mode. After reading your response my eye caught the bright blue bar of tapatalk 2s stock black theme. Probably that bar caused this because the screen is so dark with this theme but that blue bar.
But this shouldn't be taken as user error right? I think I should get a replacement screen as this phone has been in my hands for just 6 months. I'm still in warranty period.
What do you think?

Dr Fretless said:
I spend much time on tapatalk and yes in portrait mode. After reading your response my eye caught the bright blue bar of tapatalk 2s stock black theme. Probably that bar caused this because the screen is so dark with this theme but that blue bar.
But this shouldn't be taken as user error right? I think I should get a replacement screen as this phone has been in my hands for just 6 months. I'm still in warranty period.
What do you think?
Click to expand...
Click to collapse
It's not an error, amoled screens age this way, it's quite normal.
I understand it's quite frustrating, once you see it, you can't unsee it.
Especially in just 6 months of use, I noticed this on my old Galaxy S after a year, and realized it was because I was on an AOSP rom for a few months which had white messaging with a grey bar.
They probably won't replace the screen, either saying there's nothing wrong with the display.
No loss trying, they might be nice enough to give you a new display! :good:

csmiler said:
It's not an error, amoled screens age this way, it's quite normal.
I understand it's quite frustrating, once you see it, you can't unsee it.
Especially in just 6 months of use, I noticed this on my old Galaxy S after a year, and realized it was because I was on an AOSP rom for a few months which had white messaging with a grey bar.
They probably won't replace the screen, either saying there's nothing wrong with the display.
No loss trying, they might be nice enough to give you a new display! :good:
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I see... But one expect at least a year to talk about aging. It's no big deal for now but if it gets darker I don't think I'd put up with it.
Too bad I love this thing a lot but guess I'll have to avoid amoled screens for my next device...

Dr Fretless said:
I see... But one expect at least a year to talk about aging. It's no big deal for now but if it gets darker I don't think I'd put up with it.
Too bad I love this thing a lot but guess I'll have to avoid amoled screens for my next device...
Click to expand...
Click to collapse
Agreed, 6 months doesn't speak much off the quality.
I considered it too, but Samsung devices always have Amoled, and I like Samsung hardware, even though a lot of their devices are faulty, including mine.
The LCD is one of the main reasons I like HTC hardware, better color tone.

Dr Fretless said:
I see... But one expect at least a year to talk about aging. It's no big deal for now but if it gets darker I don't think I'd put up with it.
Too bad I love this thing a lot but guess I'll have to avoid amoled screens for my next device...
Click to expand...
Click to collapse
Samsung Korea replaces panels for free if they can see a burn in. People there get quite worked up about this issue on amoled displays so Samsung does replace them quietly. Heck there's even people who leave the screen on blue (apparently the best colour for getting burn ins) and get them replaced on purpose. Not sure about anywhere else though. It's worth a try visiting a Samsung service centre if you can find one near you.

xcly said:
Samsung Korea replaces panels for free if they can see a burn in. People there get quite worked up about this issue on amoled displays so Samsung does replace them quietly. Heck there's even people who leave the screen on blue (apparently the best colour for getting burn ins) and get them replaced on purpose. Not sure about anywhere else though. It's worth a try visiting a Samsung service centre if you can find one near you.
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Hey, that's good news. I'll try talking to a center when I get time. Thank you very much.

tip for you guys. this issue with amoled screen is a common issue. you can check you note 2's screen burn by doing this test, open the Phone app and type *#0*#, check colors Red, Green and Blue (blue is most commonly affected). Note 2 is my 3rd smartphone with AMOLED screen for me. the first 2 phones got screenburned big time, but I took extra care of this one. it has a little screenburn in the notification area but you can hardly tell the difference even when testing it with the test I mentioned above.
here's 2 things to avoid: exposing screen to direct sunlight, keeping screen to full brightness al the time. better luck with next amoled screen.

ovidiugr said:
tip for you guys. this issue with amoled screen is a common issue. you can check you note 2's screen burn by doing this test, open the Phone app and type *#0*#, check colors Red, Green and Blue (blue is most commonly affected). Note 2 is my 3rd smartphone with AMOLED screen for me. the first 2 phones got screenburned big time, but I took extra care of this one. it has a little screenburn in the notification area but you can hardly tell the difference even when testing it with the test I mentioned above.
here's 2 things to avoid: exposing screen to direct sunlight, keeping screen to full brightness al the time. better luck with next amoled screen.
Click to expand...
Click to collapse
Thanks for the tip. Good to know that there's a way to avoid this. I use this phone as a navigator when driving so it must have gotten a great deal of direct sunlight. I'll keep the flip cover shut when not using the maps now.
Thank you all guys.

Q: Does your screen have a blue or yellow tint?

Hi, I've noticed that my screen seems to have a warmer color tone to it, along with an slight overall yellow tint. You can see it best on light gray colors. I also had an AT&T model for a few days (returned) and that phone had a cooler, overall blue tint to it. You could really see the difference with the phones side by side. I've talked to friends with a AT&T and a Verizon version, they said their screens have the cooler toned blue tint.
So what tint is your screen, if any?
I'm wondering, maybe Tmobile just calibrates their screens for the warmer look... or is there something wrong with mine? Thanks.

aimfire72 said:
Hi, I've noticed that my screen seems to have a warmer color tone to it, along with an slight overall yellow tint. You can see it best on light gray colors. I also had an AT&T model for a few days (returned) and that phone had a cooler, overall blue tint to it. You could really see the difference with the phones side by side. I've talked to friends with a AT&T and a Verizon version, they said their screens have the cooler toned blue tint.
So what tint is your screen, if any?
I'm wondering, maybe Tmobile just calibrates their screens for the warmer look... or is there something wrong with mine? Thanks.
Click to expand...
Click to collapse
Settings > Accessibility > Color Adjustment
turquoise circle over camera is the best setting for me.

YiZK said:
Settings > Accessibility > Color Adjustment
turquoise circle over camera is the best setting for me.
Click to expand...
Click to collapse
Yes, but what was the screen tone before you did that?

OK... no one here today? lol
So I just went to T-Mobile store to compare, side by side... The screens are their demo phones actually looked worse than mine, almost a green tone to them and not nearly as bright. One thing for sure, they did not have the blueish tint to them, was more of a green/yellow. I'm beginning to think that since every carrier seems to have messed around with the software so much, they probably also adjusted the screen calibrations as well. I'm going to check at the Verizon store and another T-Mobile just to verify

Mine is t-mobile and bright white.. The nexus 5 had the same issue, 2 different screen manufacturers one with a warmer almost yellow screen and the other blue cooler feel.. I've been lucky with both my nexus 5 and g3 both are bright white screens and no yellow. You could try swapping it and hope you get a better screen.

Why with every new phone release this topic comes up? We know every screen's not made the same, some is warm some are cool.
Sent from my LG-D851 using Tapatalk

shook187 said:
Why with every new phone release this topic comes up? We know every screen's not made the same, some is warm some are cool.
Sent from my LG-D851 using Tapatalk
Click to expand...
Click to collapse
Because when people pay $600+ for a new phone that's main feature is the screen, they want to make sure nothing is wrong with theirs.

Long story short, went to my T-Mobile store to compare to display models and possibly do an exchange. Compared side by side, trying out different stock wallpapers at 100% brightness. The two display models they had were also yellowish, but noticeably much more dim. Compared to an employee's phone, his was also yellowish and very dim. My phone looked good compared to all those!
Stopped by a 3rd party T-Mobile store on way home to see their display model. Not yellow at all, it had the cooler blue tone, but also much dimmer than my phone. Decided to go to the store where I originally purchased mine and compare to those... Both display models had the blueish tone, as well as the manager's phone - however, mine was still much brighter than all. So was going to exchange and we opened the new box... That phone was even more yellowish than mine and also much dimmer. Opened another one, just as bad! Those were the last two they had in stock, so they arranged for me to go to another store and try again.
Got to the other store, they got a new phone out for me - same yellowish tone and dimmer than mine. I didn't want to make them open every phone again, so I kept my original phone and left. The manager thinks they may have gotten an "off" batch maybe, and if that were the case, then every store in the area would have phones from this batch. He suggested that I come back in about a week when they get a new shipment, perhaps from a different batch, and try again.
So... out of 10 T-Mobile phones that I saw today:
- 4 had cooler blueish tone screens
- 6 had warmer yellowish tone screens
- My phone was brighter than all of them!
Not sure what to make of all this, lol... cannot believe the differences in the displays on this phone. And why is mine so freakin' bright?? lol... Is it a freak accident or did I maybe somehow get like a 2nd revision screen on my phone? Not sure... What do you all make of this?

I've noticed no tint on mine and it's plenty bright. I keep it at 60% and it looks great

bfranklin1986 said:
I've noticed no tint on mine and it's plenty bright. I keep it at 60% and it looks great
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Mine is good and keep at 40 to extend battery just a bit. When rooted and I remove a lot of junk I will be ok for whole day.

I also noticed that (see my reply in "screen problem" thread).
http://forum.xda-developers.com/showpost.php?p=54262695&postcount=17
Open Google.com with Chrome (or stock browser) using desktop view to compare.
I used my Note 3 to compare (100% brightness).
The one has "reddish" tint seems to have more problem (dark screen, overly shaded fonts on standby screen) while "cool tint" one looks "normal". In addition, I found out cool tint one runs cool.

Nope no color tints
-Sent from my TMO LG G3 using Tapatalk

FYI, I found a corp store has both good and bad models
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DO NOT buy the one on the left (warm color). NEVER, EVER, EVER, EVER, EVER, EVER BUY WARM WHITE SCREEN MODEL!!!!!!!!

mingkee said:
FYI, I found a corp store has both good and bad models
DO NOT buy the one on the left (warm color). NEVER, EVER, EVER, EVER, EVER, EVER BUY WARM WHITE SCREEN MODEL!!!!!!!!
Click to expand...
Click to collapse
too bad you didnt have the same page up on both phones for an accurate comparison.AND, some people like warm tones more than cool ones..

mingkee said:
FYI, I found a corp store has both good and bad models
DO NOT buy the one on the left (warm color). NEVER, EVER, EVER, EVER, EVER, EVER BUY WARM WHITE SCREEN MODEL!!!!!!!!
Click to expand...
Click to collapse
Excellent - thanks for that pic!
It's crazy how bad the differences are! There haven't been many reports of bad screens, but when there are, it's usually the T-Mobile version. No idea what's going on with their phones.

mingkee said:
FYI, I found a corp store has both good and bad models
DO NOT buy the one on the left (warm color). NEVER, EVER, EVER, EVER, EVER, EVER BUY WARM WHITE SCREEN MODEL!!!!!!!!
Click to expand...
Click to collapse
how do we know the brightness was set to the same level on each phone sir ?

wavrunrx said:
how do we know the brightness was set to the same level on each phone sir ?
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Click to collapse
Why would he lie? lol
Some of the screens on the T-Mobile models vary wildly from phone to phone. If you have a good screen, then cool... but some of us do not and are trying to figure out what's going on.

ATT model I had was warm/yellow and also a little brighter. TMO one I bought yesterday is cool/blue but a little dimmer. I always prefer the cooler blue screens.

Skizzy034 said:
ATT model I had was warm/yellow and also a little brighter. TMO one I bought yesterday is cool/blue but a little dimmer. I always prefer the cooler blue screens.
Click to expand...
Click to collapse
Yeah, the cooler blue screen is normal, you got a good one.

wase4711 said:
too bad you didnt have the same page up on both phones for an accurate comparison.AND, some people like warm tones more than cool ones..
Click to expand...
Click to collapse
The reason not to buy warm tone screen one is such screen appears to have more problem (heating, overshadowing, and darker screen) than cool tone screen one.
Both were adjusted to same conditions (brightness, wallpaper) but the one on the left did not have data access.
---------- Post added at 04:47 PM ---------- Previous post was at 04:27 PM ----------
wavrunrx said:
how do we know the brightness was set to the same level on each phone sir ?
Click to expand...
Click to collapse
I already set the brightness to max on both, and set no color adjustment on accessibility.
Even you may not be able to see the page, check out the soft buttons on the bottom.
In addition, I need to check the return policy if I get "warm" screen one because I mentioned above.

Galaxy Tab S Mura Effect Problem (Test yours)

I have been noticing that when I am looking at darker solid colors they sometimes appear to have a slight gradient to them. I know this is an AMOLED panel, so when a true black pixel is displayed, that AMOLED display pixel should appear completely black (as in, NO light is emitted). This is one advantage to AMOLED panels. So even at 100% display brightness, a true black screen should appear OFF.
So I created some test images in Photoshop to see to see how different shades of black and near black appear on the screen (I tested tones from 100% black to dark gray).
From my test, I found that my tablet does in fact turn completely OFF when 100% black is displayed. BUT my panel actually appears to have a slight backlight bleeding problem (Edit: Mura Effect).This is only noticeable when I am viewing colors that are very dark (but not completely black) and consistent. Also, It it's only visible in pretty dark rooms. I am not sure if I am going to return/exchange my tablet out yet.
I thought I would share my process for others to try to see if this is a common problem first...
Here is a Dropbox link to the files I made to test the problem:
https://www.dropbox.com/sh/wtfuazfn7i7z09o/AABvbRuA7-MUx_tF7xmmGSfAa
Method:
1: Open link up in the Dropbox app on your tablet (file sizes are full screen). Or feel free to download the files to your tablet and view them in the gallery app.
2. Turn screen brightness to 100%.
3. Make sure you're in a DARK room.
3. View files on your tablet at full screen.
Image 1 should appear 100% black (your screen should appear OFF). Image 1 is NOT going to be the image that will make Mura noticeable. Image 2, 3, 4 and 5 should start to appear slightly lighter as you scroll through the images. Watch out for inconsistent shade gradients like you see on my examples below (this is what tells you if you have Mura effect problems).
Here are what my results unfortunately look like. As you can see, image 1 does appear completely black (don't mind the reflections in the pictures). But the effect is pretty obvious on images 2 and 3
What are your results?
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well first of all seeing my screen on full bright but appearing to look off was pretty cool. also on mine i did not have a bleeding problem and they all seemed to have a solid difference with nothing visible to my eye.
i have the 10.5 and had to put in portrait mode to gett full screen.
thanks

Well technically your super amoled panel cannot have backlight bleed because there is no backlight. What you are seeing is referred to as a mura effect and should not be happening with this advanced of a panel. It has been confirmed that some of the 8.4 units have defective screens. On my 10.5 unit all dark colors look solid with no mura effect at all. Here is one of your sample images on my screen. Of course if you view this on your tablet you may see the mura effect. View it on your PC.

No 'bleeding' here either.

I have a T700 (8.4) and have just testet you pictures, - mine also have some Mura Effect, however not as dominant as the ones you posted here. I can see on this link here that it unfortunately seams to be an issue on most of the units -> http://forum.xda-developers.com/galaxy-tab-s/help/users-feedback-want-to-buy-8-4-t2834969
---------- Post added at 06:50 PM ---------- Previous post was at 06:37 PM ----------
ThE_SoUrCe said:
No 'bleeding' here either.
Click to expand...
Click to collapse
Which version do you have?

AZBoomer said:
1: Open link up in the Dropbox app on your tablet your tablet and view them in the gallery app.
2. Turn screen brightness to 100%.
3. Make sure you're in a DARK room.
3. View files on your tablet at full screen.
Click to expand...
Click to collapse
Even if there is a problem if the only way to realize is to create conditions no one would ever encounter (100% brightness in a dark room on only specific backgrounds) is it really a problem?

BarryH_GEG said:
Even if there is a problem if the only way to realize is to create conditions no one would ever encounter (100% brightness in a dark room on only specific backgrounds) is it really a problem?
Click to expand...
Click to collapse
This is XDA. What did you expect?

Omg thats terrible

rockbastard said:
I have a T700 (8.4) and have just testet you pictures, - mine also have some Mura Effect, however not as dominant as the ones you posted here. I can see on this link here that it unfortunately seams to be an issue on most of the units -> http://forum.xda-developers.com/galaxy-tab-s/help/users-feedback-want-to-buy-8-4-t2834969
---------- Post added at 06:50 PM ---------- Previous post was at 06:37 PM ----------
Which version do you have?
Click to expand...
Click to collapse
T705. I noticed 3 green dots though.

I do not notice anyyhing like that on my 8.4.
I would get an exchange if you still can. Never know what the ramifications in the future to the display may be.

BarryH_GEG said:
Even if there is a problem if the only way to realize is to create conditions no one would ever encounter (100% brightness in a dark room on only specific backgrounds) is it really a problem?
Click to expand...
Click to collapse
Exactly this. Some people have waayyyy too much time on their hands, I don't know how they manage to live their lives if this sort of nothingness is enough to trouble them. What exactly are you intending to do with this tablet, color time a Hollywood movie?
Must be a real killer for some people every time they have to change channel on their tv, I have to wait 0.4 seconds for the next station to come on. It's terrible.

Nobody can see this with their naked eyes.
Everyone that posts about this use ultra high iso pictures to show it.
Its a non problem.

DAvid_B said:
Nobody can see this with their naked eyes.
Everyone that posts about this use ultra high iso pictures to show it.
Its a non problem.
Click to expand...
Click to collapse
It actually is pretty noticeable even at 25% brightness when you're just using the tablet normally. Now it doesn't show up everywhere. You can see it pretty easily in the notification shade and in the settings menu. Or when you open up Chrome with no tabs, that background is not perfectly solid and I notice it every time. You can also see it on darker full screen photos too.
Still not sure if I care enough to exchange it. Although, I am very picky about image color representation as I am a photographer and this panel on AMOLED Photo mode matches my calibrated monitors pretty well, but that dark gradient just bothers me sometimes!

AZBoomer said:
It actually is pretty noticeable even at 25% brightness when you're just using the tablet normally. Now it doesn't show up everywhere. You can see it pretty easily in the notification shade and in the settings menu. Or when you open up Chrome with no tabs, that background is not perfectly solid and I notice it every time. You can also see it on darker full screen photos too.
Still not sure if I care enough to exchange it. Although, I am very picky about image color representation as I am a photographer and this panel on AMOLED Photo mode matches my calibrated monitors pretty well, but that dark gradient just bothers me sometimes!
Click to expand...
Click to collapse
Is yours also the 8.4 version?
3 I work with all have the 8.4 (T700) version myself included. All have visible Mura effect at normal settings. Samsung run an ad campaign here in Denmark, where you can buy and try for 30 days one did an exchange - but same result, visible Mura effect - however under normal working conditions is not a big issue.. Bur as a still photo viewer I understand your point.

Mine has dark mura at top right corner with dark banding at the lower screen

rockbastard said:
Is yours also the 8.4 version?
3 I work with all have the 8.4 (T700) version myself included. All have visible Mura effect at normal settings. Samsung run an ad campaign here in Denmark, where you can buy and try for 30 days one did an exchange - but same result, visible Mura effect - however under normal working conditions is not a big issue.. Bur as a still photo viewer I understand your point.
Click to expand...
Click to collapse
Yes, I have the 8.4 inch version. If it really is that common, I may just keep it. It does bother me, but overall I am happy with the tablet and am happy with the battery life. Not sure I want to chance getting a new one it it not being any better...We'll see though.

BarryH_GEG said:
Even if there is a problem if the only way to realize is to create conditions no one would ever encounter (100% brightness in a dark room on only specific backgrounds) is it really a problem?
Click to expand...
Click to collapse
These are the conditions to make it easily noticeable. I on my hand did notice the issue on regular use of the tablet:
- First noticed it while reading an e-book, the tint of the background was not homogenous.
- Then I noticed it while browsing the tablet options: "huh, the gradient on the background is not regular.. oh wait, it's not supposed to be a gradient".
- And now I notice it while playing movies, when the scenes are dark.
100% brightness is not a requirement for it to be visible. Actually, minimal brightness while in the darkness works very well at revealing the issue.
However, it is extremely unlikely that someone ever notice the issue while using the tab in daylight. In my case, I use it mainly in the darkness, and often get to see it.

Damn you OP, mine got it too...anyway, it isn't really noticeable with most content so I just keep mine since it seems very common anyway.

That's defective. You guys should not be satisfied at keeping it like that. I have no such effect. I'd take it back if it were mine. I didn't pay $600 for a tablet to have a defect like that

Inkedadrenaline said:
That's defective. You guys should not be satisfied at keeping it like that. I have no such effect. I'd take it back if it were mine. I didn't pay $600 for a tablet to have a defect like that
Click to expand...
Click to collapse
I don't know if it's defective, but if it is it's a defect that affects most AMOLED screens and all of the Tab S 8.4 I could test it for (3 of them). My Galaxy SII is affected as well, so is my PS Vita. And my friend's. And his Note II.
I returned my unit twice, once through the online store and once through the physical one, all of them suffered from Mura effects. Either I am utterly unlucky, or a large amount of the tabs are affected.

V30 Screen Colors and Achieving D65 white. A Guide.

First off, D65 is impossible on this phone without using Comfort View.
The best I was able to achieve (using a Konica Minolta CS-200 chroma meter, brightness at 50%, auto deselected) was x=.285, y=.325 (D65 is x=.313, y=.329), so I'm a little on the blue side. Here are the settings I used:
Screen Color:
Select Custom and hit the gear icon
Color Temperature: Cooler (slider all the way to the left).
RGB Levels:
Red: maximum
Green: maximum
Blue: MINimum
Result: x=.285, y=.325
If this is too green for you and you're ok with a little more blueness, decrease green until you're happy.
If you want true D65 white point, you have to use comfort view to filter out the blue, but then you lose your ability to use comfort view on a schedule. When you set comfort view to the setting just to the left of center, you'll get x=.313 y=.335, which is pretty much dead on (the slight green shift is pretty tiny). I did not yet measure the individual RGB illuminant values.
You will notice that these color values feel incredibly red or yellow compared to stock. You might not even like them. But they are technically more "white" from an sRGB standpoint. When I hold the phone up to my calibrated monitor, even the corrected version above looks incredibly blue. The comfort mode version looks about right. It will make your photos look more natural though. I have a photo of a sandwich that got more delicious after making these changes. Seriously, mouth watering.
For reference, the stock color profiles look like this:
normal: x=.276, y=.288
movies: x=.287, y=.300
photos: x=.287, y=.300
web: x=.286, y=.288
In all of them, the blue value is incredibly high. high blue will drive down both x and y coordinates. It looks to me like this panel is red-limited.
The color temperature was a bit unintuitive, but given the above red limitation, I think it simply removes green and you end up back where you started. Hence leaving it at full "cool".
So if you plan to take photos and want more accurate color when you do, try the above settings and compare the photos when you view on your phone to when you view on your computer monitor.
References: CIE chromaticity chart: D65 is 6500k on this chart. x and y coords are along the horizontal and vertical axes. You'll notice that x=.313, y=.329 cross at the 6500k point.
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I've also attached some simple R, G, B, & W test images and a gradient.
y8s

Interesting ... thanks!

By default it is too warm and you're dialing the warmness back to neutral ? ? ? ? I think samsung defaults to warm also ( in what I've seen... )
.
I think I want a little warm.

old_fart said:
By default it is too warm and you're dialing the warmness back to neutral ? ? ? ? I think samsung defaults to warm also ( in what I've seen... )
.
I think I want a little warm.
Click to expand...
Click to collapse
By default it is very BLUE. Blue is what most people consider "cool". Even with my adjustments, it still leans a bit cool/blue. I'm not sure this display will ever be able to look "warm" with the factory adjustments.

I dunno, using those settings and without activating the comfort view, it looked too warm.

CHH2 said:
I dunno, using those settings and without activating the comfort view, it looked too warm.
Click to expand...
Click to collapse
Don't trust your eyes after staring at a blue phone all day. Get a piece of white paper and sit the phone next to it. Compare that or a computer monitor. Also try using it this way for a couple days. Once you start to get used to it (or forget you changed it), switch back to "normal" and see what you think of that.

y8s said:
Don't trust your eyes after staring at a blue phone all day. Get a piece of white paper and sit the phone next to it. Compare that or a computer monitor. Also try using it this way for a couple days. Once you start to get used to it (or forget you changed it), switch back to "normal" and see what you think of that.
Click to expand...
Click to collapse
I stare at a calibrated computer monitor all day and paper all day. Sliding the blue all the way down definitely makes mine too warm.

CHH2 said:
I stare at a calibrated computer monitor all day and paper all day. Sliding the blue all the way down definitely makes mine too warm.
Click to expand...
Click to collapse
Probably is a wide variation in displays. I calibrate LCD and OLED microdisplays pretty often and we see all sorts of things from batch to batch.

This excellent review shows a lot of nitty gritty display data ( and you can compare too ) . . . . . .
https://www.phonearena.com/reviews/LG-V30-Review_id4437#

I did like you said with Comfort Filter and sliding the overall color one notch to the left. Yes, compared to a piece of paper the display looks quite close to white. But when I start using apps, the color seems fairly off to me. I acknowledge this is ME, not the phone. I'll probably make a more concentrated effort to change over a few days.
I was wondering how closely we'd be able to get the screen to 6500 K because that's one area my old S7 really excelled in. Thanks for the tip!

Thanks for bringing this subject to my attention. For no apparent reason, I have been a little wary of playing with the color settings. Very glad that I did today. I'm using a calibrated monitor screen to match whites and colors and my optimum settings are way different than the OP's.
I bumped the color temp one click towards warm and then backed off only the blue slider about 25%. Bingo...it's spot on.

Has anyone tried to play with the sRGB setting in the developer options? Is there any use for this?

qualitymove13 said:
Has anyone tried to play with the sRGB setting in the developer options? Is there any use for this?
Click to expand...
Click to collapse
I've enabled it on my phone, but it doesn't stay on. I have no idea why.

stuartmc said:
Thanks for bringing this subject to my attention. For no apparent reason, I have been a little wary of playing with the color settings. Very glad that I did today. I'm using a calibrated monitor screen to match whites and colors and my optimum settings are way different than the OP's.
I bumped the color temp one click towards warm and then backed off only the blue slider about 25%. Bingo...it's spot on.
Click to expand...
Click to collapse
I tried it your way and it ended up just about the same as the other way...

One other thing to note is that we can only change one setting per color, not the gamma curve. Who knows what that looks like. Our changes may be trivial. I just set the white point. Maybe when business gets slow I'll go back and measure the white point of various gray levels and see what I find.

thanks for this...using the recommended settings resulting in a green display for me.
i ended up leaving the cool/warm slider in the middle and moving the blue slider one click to the right of center. green one click from the right most. this gave me the most neutral balance of colors. muted but natural to my eyes.

I was wondering what my eyes were seeing. Something in the back of my head was telling me the display was blue.
Comfort view seems to offer the best balanced color on my screen.
Hopefully LG will allow more color control in software.
Sent from my LG-H932 using Tapatalk

hemirunner426 said:
I was wondering what my eyes were seeing. Something in the back of my head was telling me the display was blue.
Comfort view seems to offer the best balanced color on my screen.
Hopefully LG will allow more color control in software.
Sent from my LG-H932 using Tapatalk
Click to expand...
Click to collapse
There is. There's an entire menu devoted to tweaking the color of the screen to your liking.

stuartmc said:
Thanks for bringing this subject to my attention. For no apparent reason, I have been a little wary of playing with the color settings. Very glad that I did today. I'm using a calibrated monitor screen to match whites and colors and my optimum settings are way different than the OP's.
I bumped the color temp one click towards warm and then backed off only the blue slider about 25%. Bingo...it's spot on.
Click to expand...
Click to collapse
Can you take a screenshot of your sliders? It's been a long day and my brain can't comprehend which way you moved the color temp slider and whether you meant set the blue slider to 25% or take off 25%.

NayrStrebor said:
Can you take a screenshot of your sliders? It's been a long day and my brain can't comprehend which way you moved the color temp slider and whether you meant set the blue slider to 25% or take off 25%.
Click to expand...
Click to collapse
Take off 25% is what I understood from what he said.