Related
As seen by the NoLED app over in the dev section, and in a few other places on the net, people are finding that when they display a black image on their amoled/samoled screens in a dark room there is still light emitted by the display. it is not truly black
I would like to know why!
One thing i hear is about image compression and signal noise causing the pixels to not display #000000 black and instead a variant of black/grey causing the pixel to become lit.
This problem is not an issue during the day, i can't tell the difference when my screen is displaying black or off. but what it does effect is battery life.
If the screen isn't powering down its pixels then it is not saving anywhere near as much power as it could do
Also
How happy are you with your display?
I knew about the pentile problem before buying, however i am not dissatisfied with the display at all. Infact if i did not read up about it i would not have realised there was anything different with the screen.
Text is clear and sharp, images are vibrant, and colours seem true with no issue of pink problems like the desire
looool, look at any lcd screen(tv whatsoever) and you don't have true black, because the backlight is on. Only the best LED LCD screens in TV world have FULL LED backlight that can dim the leds from parts of the screen that are fully black in the processed image.
take care
yup, if you take apart your LCD watch, phone, laptop or monitor
you'll see 2 layers, first layer the LCD/TFT/AMOLED/SAMOLED/etc whatever new technology screen you can think of name it here.
then the bottom layer is pretty much like a light bulb/white led/ccfl or whatever you want to call it to light up the first portion of the screen.
most devices you can control the 2 separate pieces separately via "screen" and "back light"
you'll noticed that usually on software options what specifically lets you control both indedpendly.
Eh.. Yes But the SGS hade OLED screen. So it should be able to turn pixels completly off. My guess is that each led has some very small current applied to it possibly to speed up response off screen.
But it come close to true blacks..
EDIT
OLED screen has NO backlight... Each pixel is an tiny led...
Sent from my GT-I9000 using XDA App
thanks for the heads up, that's good to know
i've yet to take apart a new SGS to figure out how the AMOLED displays works
You guys need educating on displays lol
oled screens have no backlight, thus no backlight bleed.
That means that this is a software issue, unless the screen not powering down completely is intentional
Software issue and nothing more.
Open up the calculator, drag down the numpad, hide the 2 stripes (status bar and numpad drag bar) in the top and bottom of the screen, and tell me if you see any lighting.
There's absolutely nothing.
there is still light emitted. cover up the top and bottom bar with your hands, go into a completely dark room then look into the center of the screen.
There is a uniform glow, just like when looking at a black image in the gallery or browser
It's actually more noticeable if you look AWAY. The peripheral area of your retina will be able to pick up a very feeble amount of light. Feeble, sure, but it's there nonetheless.
seriously, guys?
XQC said:
seriously, guys?
Click to expand...
Click to collapse
The problem is that the way it is supposed to work is that if you display black, the screen shouldn't use any energy at all but it is and people can see it and so is using precious battery charge.
The issue is... that apps like noled which were going to display a red dot on the screen to let people know if they had mail waiting or whatever wouldnt use much power at all because they were displaying mainly a black screen but it isnt actually black and still using light so still chews through the power..
hope that made sense.. but that is why people are interested in it..
Ok, I missed the battery part, sorry If so, it is indeed an annoyance...
I thought people were seriously complaining about image quality.
I have the Samsung wave and it uses the same screen technology and I can tell that it does not have true blacks pixels are still lit, I can easily tell that its on and totally off there is a very faint trace amount of light produced..
Since I first got this device and turned it on I have been impressed with the display. I am kind of partial to AMOLED diplays and am, thus, a bit biased. What surprised me was that it "appeared" sharper than the display on the Nexus One. Considering it is slightly larger and at the same resolution I just assumed that it wasn't using the PenTile arrangement - yet it appears that it does in fact use the same subpixel arrangement as the screen on the Nexus One. My point is... now I've forgotten my point. Basically that I am more than satisfied with this display.
As far as the black issue is concerned I have no idea. There must be some reason considering that was one of the supposed strengths of this technology (i.e. true blacks and lower power consumption).
El Mono
wait so why would you display an image if you want to save battery?
really
How many of you have measured how much power is being used up when the display is displaying a true black image(measured with multimeter, or other measuring device)
How many of you have made sure that the glow is not caused by a residual charge in the display?
How many of you know how much time it takes for the "glow" to leave an OLED panel when power is not being applied?
just some food for thought
The thing is, amoled screens were advertised as having true blacks and having the pixels off when displaying black. this is clearly not the case
It's not an issue with the technology. The screen doesn't have a back lighting panel, so i think it's more of a problem of what shade is default defined as "black" in the system, or something with any current running through the screen.
Well considering the screen doesn't turn off when displaying a 100% black bitmap image, its safe to say that the say that the pixels NEVER turn themselves off during use when displaying black
Could be the screen isn't calibrated properly, or they lied to us about the tech(wouldn't be the first time).
While its not "true black" it is defenently beyond what any backlit screentype can do regarding blacks.
Except perhaps for the retina display forged by god himself
But I agree that if Samsung states True black then it should be able to do that.
Sent from my GT-I9000 using XDA App
I own both Samsung Captivate and Focus, both devices have SUPER AMOLED screen. Both devices have burn-in problem after months of usage.
Captivate:
I could see the notification bar on top of the screen with the fuzzy clock and battery indicator burn-in to the screen with very pale color especially very noticeable with a white screen! I also saw AT&T stores had these demo units experiencing the exact problem! I then called up Samsung to replace the Super AMOLED screen. Now it's fine but very annoying.
Samsung Focus:
I just got mine in Dec and didn't use a lot on that device. There is a very good reason why WP7 has to hide those status indicators on top to prevent Super AMOLED screen burn-in problem. I also checked out the demo units in AT&T stores, all of the Focus had Windows Phone 7 logo burn-in to the screen at the top left corner due to the static logo constantly playing on the demo mode.
In conclusion:
SUPER AMOLED screen's quality life-time is still short compare to LCDs. Given about 2 months of usage, 8 hours a day with static image such as notification bars for example, burn-in issue is inevitable! In real-life daily usage, give it about 2.6 hrs a day, your screen will be burnt after 6 months.
NEVER USE SUPER AMOLED SCREEN WITH STATIC IMAGE!
On my phone the screen isn't on for very long periods. Even when I am talking on it if near my face the screen is off.
How does this compare to your experience?
Does a phone in demo mode have the screen on constantly?
The only reson OLED isn't so widely used is because of its limited life span (especially on blue color). From what I read in the past, it is very difficult to get blue channel pixels pass 2,000 hours of life span. Not sure if AMOLED or SAMOLED made any advancement in this area. So, the precautions should always be taken. Let your phone screen on 8-hour a day is not a good approach. That's why there is a setting to let phone go into sleep and turn off the display.
My Captivate has been working flawless since August 2010 with zero image retention or burn in.
foxbat121 said:
The only reson OLED isn't so widely used is because of its limited life span (especially on blue color). From what I read in the past, it is very difficult to get blue channel pixels pass 2,000 hours of life span. Not sure if AMOLED or SAMOLED made any advancement in this area. So, the precautions should always be taken. Let your phone screen on 8-hour a day is not a good approach. That's why there is a setting to let phone go into sleep and turn off the display.
My Captivate has been working flawless since August 2010 with zero image retention or burn in.
Click to expand...
Click to collapse
How many hours per day do you keep your screen turned on? I would give that minimum 480 hrs with static image to experience burn-in. No need to wait 2000 hrs of life-time in Blue Channel in AMOLED.
The life-time of the entire Super AMOLED is here and I'm also being conservative: 480Hrs to start to get burn-in issue using AT&T store demo units as reference.
wildbilll said:
On my phone the screen isn't on for very long periods. Even when I am talking on it if near my face the screen is off.
How does this compare to your experience?
Does a phone in demo mode have the screen on constantly?
Click to expand...
Click to collapse
I use skype and bluetooth headsets alot, so screen shut down may not happen at all until i manually shut off the screen. Moreover, using GPS navigation will definitely cause burn-in problem with static images such as the miles, eta, notification bar, clock, battery indicator, etc.
Android is just not a good OS for Super AMOLED. WP7 on the other hand is for Super AMOLED.
I'd estimate less than 30 minutes total per day (only counts screen on time). So, 480 hrs should let me use my phone for 960 days, or way beyond my tolerance for an *old* phone.
If I'm sitting in a meeting broswing internet or reading news using some apps, almost all of them are full screen and won't necessary have static images on the fixed locations.
Turn the brightness down (I use auto brightness setting) and don't let the screen on for extended period. You will be fine.
squarejp said:
Android is just not a good OS for Super AMOLED. WP7 on the other hand is for Super AMOLED.
Click to expand...
Click to collapse
I have to agree. The metro color schem (black in most of the screen) is the best way to reduce AMOLED battery usage and lower the potential burn-in risk.
squarejp said:
I own both Samsung Captivate and Focus, both devices have SUPER AMOLED screen. Both devices have burn-in problem after months of usage.
Captivate:
I could see the notification bar on top of the screen with the fuzzy clock and battery indicator burn-in to the screen with very pale color especially very noticeable with a white screen! I also saw AT&T stores had these demo units experiencing the exact problem! I then called up Samsung to replace the Super AMOLED screen. Now it's fine but very annoying.
Samsung Focus:
I just got mine in Dec and didn't use a lot on that device. There is a very good reason why WP7 has to hide those status indicators on top to prevent Super AMOLED screen burn-in problem. I also checked out the demo units in AT&T stores, all of the Focus had Windows Phone 7 logo burn-in to the screen at the top left corner due to the static logo constantly playing on the demo mode.
In conclusion:
SUPER AMOLED screen's quality life-time is still short compare to LCDs. Given about 2 months of usage, 8 hours a day with static image such as notification bars for example, burn-in issue is inevitable! In real-life daily usage, give it about 2.6 hrs a day, your screen will be burnt after 6 months.
NEVER USE SUPER AMOLED SCREEN WITH STATIC IMAGE!
Click to expand...
Click to collapse
I have both devices and neither or them display image retention. What method or program are you using to test this?
I downloaded a flashlight app on the captivate and on the Focus so I could turn the whole screen white. I also adjusted it to other color,s still see no burned in images.
I've had my Captivate and Focus since day one when they were first released by AT&T.
Go to any AT&T cooperate stores to check out all the burn-in screens. For captivate I use screen test. It cycles from white, black, green, red, blue, and other pallets. I can garauntee you that all Super AMOLED screens are the same given static images and keep the screen turned on such as notification bar, full battery notification, GPS app.
If you don't have any burn-in problems that means you haven't used the screen long enough even you got your devices since launch.
Sent from my SAMSUNG-SGH-I897 using XDA App
squarejp said:
If you don't have any burn-in problems that means you haven't used the screen long enough even you got your devices since launch.
Click to expand...
Click to collapse
The key here is to keep the screen-on time as short as possible. For normal usage, it will be fine. Will it have burn in 2 or 3 years down the road? Sure, but I probably have to dig it out from the bottom of my drawer to check it out by then. I'd rather enjoy my sharp crispy and colorful SAMOLED for 2 years than worry about burn-in and settle for murky, low contrast and washed out color of the LCD screen for 2 years.
Store demos are the worse case senario.
foxbat121 said:
I'd rather enjoy my sharp crispy and colorful SAMOLED for 2 years than worry about burn-in and settle for murky, low contrast and washed out color of the LCD screen for 2 years.
Store demos are the worse case senario.
Click to expand...
Click to collapse
Very true! But still people really need to beware of their SUPER AMOLED screen. But for gamers...... make sure don't allow a static screen staying on for too long.
Well, I was reading an email yesterday on my focus and noticed that the smiley message icon was like a little ghost in the background. I also noticed the circle/arrow icon. I use orange on black mainly. I moved the tiles around a bit, we'll see if it goes away.
jmerrey said:
Well, I was reading an email yesterday on my focus and noticed that the smiley message icon was like a little ghost in the background. I also noticed the circle/arrow icon. I use orange on black mainly. I moved the tiles around a bit, we'll see if it goes away.
Click to expand...
Click to collapse
and disappeared?
No, it did not go away. It's only visible on white screens, but it is definitely there. I guess I'm going to drop by the at&t store to see if it's a warranty issue, but I highly doubt it. My guess is I'm stuck with it. Since I use the black theme it's not a huge issue, but when I switch to the white theme it looks pretty awful.
squarejp said:
Very true! But still people really need to beware of their SUPER AMOLED screen. But for gamers...... make sure don't allow a static screen staying on for too long.
Click to expand...
Click to collapse
Why beware? Image Persistance can happen on any screen that is left running static for long periods of time. In most of the AT&T stores that I have been in the demo units are set to stay up and running for which I can only assume is to attract people. This will cause the image persistance that you are talking about. These phones screens also get used a lot more than your personal cell will.
Use your phone and don't worry about something that may or may not happen. In two years or less you will likely have a new one anyway.
Hilarious!
This reminds me of the times where projector tvs and lately plasma tvs exhibit the same not-suitable-for-gaming problem! LOL
That's one of the reasons I got the Motorola Atrix with its LCD screen!
My previous smartphone was a Nexus One and even though it didn't exhibit ghosting problems, I always tried to use it as little as possible and used the screen on its dimmest setting.
Now I can leave the screen on at full brightness for hours (like for GPS driving for instance) without any remorse!
I have the the imprint of Internet Explorer Mobile's chome burned onto my screen.
1+ hour of continuing browsing daily.
day2die said:
I have the the imprint of Internet Explorer Mobile's chome burned onto my screen.
1+ hour of continuing browsing daily.
Click to expand...
Click to collapse
Im a high internet user and txtin user etc.. and on my old galaxy s i had the qwerty keyboard burnt onto my screen and not i have my galaxy s2 i can see the same thing startin to happen. For me if this isnt sorted by the time i get another phone in say a yr n half, as much as i adore my amoled screens im defo not goin down that rd again, wat a shame they cnt sort this out, and they r makin thousands of phones and tablets with these screens, so not cool samsung
D79_ said:
Im a high internet user and txtin user etc.. and on my old galaxy s i had the qwerty keyboard burnt onto my screen and not i have my galaxy s2 i can see the same thing startin to happen. For me if this isnt sorted by the time i get another phone in say a yr n half, as much as i adore my amoled screens im defo not goin down that rd again, wat a shame they cnt sort this out, and they r makin thousands of phones and tablets with these screens, so not cool samsung
Click to expand...
Click to collapse
They have been trying very hard in the past decade or so. The main problem is the blue channel pixels' life span. Most companies have ditched their effort and move to other technologies. That's the main reason why there is no consumer TVs made of the OLED screens other than the $4000 Sony 14" OLED tv.
Unless there is a scientific breakthrough, this situation will remain for years to come.
Has anyone dealt with Samsung Tech support on this issue I just got off the phone with them and they wanted me to do a Hard reset. I tried to explain that this was a physical issue, but they still wanted to follow their script.
Now they have sent me a label to send it off but want me to remove my SD card. It ismy understanding that this card is bonded to the phone and cannot be used in a replacement phone if they send me one. I am going to call them back ut based on my previous conversation I am not holding out hope that anyone there will know what I am talking about.
For all of those who want to know if the Samsung Galaxy S3 screen can get screen burn, the simple answer is YES. I've just been to Harvey Norman Computers and just seen one working model on display and because they are left on all day and usually on the one screen because nobody is using it it gets really bad screen burn in. Just thought I would let you know.
Have a nice day.
That sucks
Sent from my GT-I9300 using xda premium
Such kinds of posts without some evidence are non sense.
Perhaps you need to "donate" to get some evidence..
It sure does. It's not going to put me off from buying one though, just have to be carefull and by the way, the screen on this phone is fantastic in my opinion. Heaps better than my Galaxy S2.
da.trute said:
Perhaps you need to "donate" to get some evidence..
Click to expand...
Click to collapse
I already did...
Makes sense, but who actually leaves their screen on all day long?
My screen timeout is set to two mins...unless your phone is a display model in a shop why would you have the screen on with a static image all day long?
In other words I fail to see how this will affect the masses.
But in any event, thanks for the info dude!
All AMOLED (active-matrix organic light-emitting diode) burn in...
"The organic materials used in AMOLED displays are prone to degradation over a period of time. However, technology has been developed to compensate for material degradation." (Source)
As a result, Samsung decided to use PenTile AMOLED on the S3. PenTile generally do not burn in/degrade as much as regular RGB matrix (like the S2) as PenTile is missing a full set of Sub Pixels, in which the particular colour "blue" have the tendency to degrade faster than the other colours...
I have visible burn in marks of the keyboard on my S2 when the screen is dimmed, however its effects is virtually non existent when at 100% brightness. Im not a particular big fan of PenTile when I saw the original S1, but now with such high DPIs on the screen of S3, the PenTile looks virtually to be the same as RGB matrix so doesnt bother me...plus less burn in...so no loss there...but be aware that a certain level of burn in is to be expected...
Just over a year ago when I got my sgs2 I noticed what might be described as burn in. At the time many of us took to the forum to discuss the horror we'd discovered with our new super amoled toys.
A year later and I don't even think about it because it is not burn in as we know from CRT displays. The image can just be left behind a little longer than other displays but they do go.
This is really nothing to worry about and is just a characteristic of amoled.
If I watch videos quite a lot on my phone the possibility of screen burn is going to be reduced significantly isn't it?
ballsofsteel said:
If I watch videos quite a lot on my phone the possibility of screen burn is going to be reduced significantly isn't it?
Click to expand...
Click to collapse
the effects of AMOLED degradation is more profound if it continues to display the same frame (such as a video on pause or menu icons) as they are displayed continuously on the same pixels for a longer period of time compared to other various pixels that may alternate...similar issue to plasma TV...as the "backlit" is produced from each individual pixel...thats why it was never used as computer monitors...
TFT LCD and other various and similar LCDs technologies do not have this issue since the illumination produce upon the entire panel...(thus lower contrast ratio compared to AMOLED)...
For this reason i would be happy to know if there is some application that hide completely the status bar... it's the only thing it's quite alaways displayed...
Totòòò said:
Such kinds of posts without some evidence are non sense.
Click to expand...
Click to collapse
Are you kidding? There is no evidence suggesting that the SGS3 will not be affected by burn-in, considering pretty much every OLED screen in existence is susceptible to it.
To those thinking "because it's PenTile it won't get burn-in", I will just remind you other PenTile displays have suffered from burn-in as far back as the Nexus One.
I seriously doubt the SGS3 is any exception to burn-in. It's just a side-effect of OLED technology in general.
It should not be an issue if you don't leave the display on a static image- and if you're very paranoid, you could install a custom ROM that allows for complete hiding of the status bar when you're not using it (I would imagine the SGS3 will have a ROM with this capability soon if it doesn't already).
Dumb question but if i have my gs3 on full brightness will that up my chances of getting a burn in?
I have an app from the market called burn in saviour, it runs the taskbar in different colours while the rest is black to help degrade the taskbar with the rest of the screen.My only problem at the moment is it was setup for the s2, I don't know how many pixels the s3 taskbar is. If anybody can tell me I would really appreciate it.
Sent from my GT-I9300 using xda premium
Samoled displays are, according to the samsung source on the amoled wikipedia page, rated to run for 8 hours a day for 5 to 8 years before being reduced to half their brightness.
So basically you are not likely to own the phone long enough for "screen burn in" or more accurately the degradation of the organic componants of the display to actually become a legitimate problem.
Sent from my LG-P920 using xda premium
Remember that blue is the worse colour for burn-in, which its why Samsung use green colors in the notification bar. Try not to use blue if you can, if you get a ROM that uses blue, user a theme to change notification bar to green.
Sent via TCP/IP
With stock rom it's impossible change the color of the status bar... i have root, is it possible to permanently hide the status bar maybe through an app?
Apex launcher, actually several launchers let you hide the dock and status bar.
Sent from my SPH-D710 using xda premium
Sure, i use nova launcher, but it hide the dock bar only in home and app drawer, for the rest of application like gmail, system setting and many other app the status bar is still here...
Introduction
If you own a OnePlus One and have kept up with news covering it, you should already be aware of the infamous "yellow tint/band/gradient/screen/tinge" (how many terms have been coined for this phenomenon?). If not, basically, it's an issue that has evidently plagued some* OnePlus Ones.
*I find that people can be generally divided into four camps:
All OnePlus Ones are perfect, the yellow tint doesn't exist
All OnePlus Ones are affected, none are perfect
Some^ OnePlus Ones are affected to different extents, but most are unaffected
Most^ OnePlus Ones are affected to different extents, but some are unaffected
^The proportion of affected vs. unaffected Ones is very unclear. Both of these cases are based on the fact that there are people who own OnePlus Ones that are completely fine, and the portion of affected users are the vocal minority.
I'm in the third camp. Mine has shown the tiniest bit of tint since day one (bottom 1/10th of the screen, more visible when looking down from above), remained unchanged after a month of owning it, and to this day remains unchanged as of the day before yesterday (17th December 2014).
SPOILER: 1 Month of Use
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SPOILER: Day Before Yesterday
Pictured: @Aaahh's pretty neat software fix, turned off
I need to learn how to work the manual settings on my camera.
When displaying a prominently white screen/image/webpage, there is a visible yellow "tint" (let's just call it a tint for now) at the bottom of the screen that's "yellow-er" than the rest of the screen, right above where the capacitive buttons are. It is also the edge where the backlight LEDs are situated. Now, its severity depends from case to case, and often it doesn't really affect functionality, but it's there, when it shouldn't be.
OnePlus has kinda addressed this in two threads, but the conclusion was a bit ambiguous. The first thread thread addresses an "overall yellowish hue", and details how OnePlus sources panels from JDI, different factories have different batches, different screen temperatures, other flagship phones also suffer from this etc....and the second thread thread lines up the One with other phones and is seemingly normal.
As far as I know, "officially" speaking, this issue doesn't exist. People have RMA'ed their yellow tinted One (success? failure?), others who have purchased multiple Ones have the tint on all of them (at different extents, never subsided), and some other stuff. I couldn't keep track of it all.
So, knowing me, I downloaded the RAW files from the second aforementioned thread and checked the EXIF data. I'm sure their one wasn't affected, so it wasn't to determine whether the image was doctored. I just wanted to know all of the settings they used to take those two pictures, so I could replicate those shots. It's a good opportunity to try out my Canon 450D!
Note that the Canon 6D is a full frame camera, and the Canon 450D is a crop frame, so there's a crop factor difference of 1.6x. Full frames also capture more light than crop frames, among other differences like how the 450D is only 12.2 MP and doesn't have multi-segment metering...it was free though, so I can't complain :silly:
Picture 1: f/4, 1/125 s, ISO 100, 24-105 @ 47 mm, no flash, using Manual mode and multi-segment metering (+ a whole bunch of other stuff)
Picture 2: f/4, 1/25 s, ISO 320, 24-105 @ 50 mm, no flash, using aperture-priority AE and multi-segment metering
My attempt at replicating those pictures (to emulate the wider angle of a full frame, I used a 32 mm focal length instead of ~50 mm, which also changed the aperture from f/4 to f/4.5):
Left is unaltered original, right is messing around with levels
Picture 1: f/4.5, 1/125 s, ISO 100, 18-55 @ 32 mm, no flash, using manual mode and center-weighted average metering
Picture 2: f/4.5, 1/20 s, ISO 400, 18-55 @ 32 mm, no flash, using aperture-priority AE and center-weighted average metering
I'll see if I can upload my RAWs too.
Conclusion? I'm a noob at Photoshop/photography. But I can see why people alter the picture and take them at extreme angles; it's too hard to capture on camera. You see it with the naked eye, but it's really hard to capture what you see using a camera.
From the second thread:
Another thing to consider when seeing photos of the yellow band problem is that a lot of the photos were taken at extreme angles with Contrast and Levels changed for more visibility. We have been able to replicate some of the pictures posted here by playing with the Levels settings in Photoshop and the angle at which the picture was taken. We have attached the raw files and settings used to manipulate them in Photoshop below so you can download them and reproduce these images.
Some people have complained that their screen’s yellow hue is due to a “bad” batch. This is not true. JDI and OnePlus extensively test the quality of the screens, and while the factory hue of the screen may vary slightly by batch, we can recreate the level of “yellowness” through software changes.
Click to expand...
Click to collapse
Interactive part! To those who have a yellow tint that's more visible than mine, take a picture of it and post it below.
Different Circumstances?
Yes, I am aware that the screen temperature variation and unevenly diffused backlight/yellow band issue plagues not only the OnePlus One. This will be covered in the posts after this one.
In OnePlus' first explanation thread, some points were made; OnePlus deliberately chooses warmer displays for aesthetics, different batches have varying color temperatures, the latest CM11S update (as of 21 June 2014) is calibrated to be warmer to avoid fatigue, and we are reassured that this can be rectified through software.
I think not all Ones have a distinctively warmer display (I must've missed that warmer displays window), because my One's display looked pretty cool on CM11S 38R, and still looks pretty cool on PA 4.6 Beta 6 at stock settings (PA doesn't have any options to change the tone of the screen) when compared with the iPhone 6+. Say what you will about Apple, but the iPhone 6 Plus makes a great reference display device, because it's factory calibrated to full sRGB standards (quoting an Apple Store Genius (lol) and Apple's specs page).
Here's the iPhone 6 vs. the OPO on LiquidSmooth Lollipop:
Since PA is not CM11S, it doesn’t have a default warm screen temperature bias. I have been told that PA uses a "stock" color profile. Whether this is stock CM11S or stock AOSP I'm not sure. I will flash 44S (edit: probably not) on my One whenever I can. I wish I hadn’t encrypted it. In order to remove the encryption, the whole internal storage (all my stuff and the system) has to be wiped too, and I'm having difficulty backing up the contents. (encryption works on PA 4.6 for the OPO btw, but only use it if you really need it; TWRP doesn't get themed if you encrypt the phone)
After occasionally looking into it on-and-off and not really yielding any definitive results, it can be deduced that there are a few main possibilities that may contribute to this yellow tint:
The backlight LEDs were placed too close to the visible display area of the LCD, so the light didn't have enough room to fully diffuse before becoming visible, resulting in the yellow tint ("the "all ones are affected" camp)
Due to high demand and low supply, the factory at which the screens were produced were forced to ramp up production, rushing the LOCA curing process, resulting in some phones having "undercooked" displays that have a yellow tint localized at the bottom portion (the "some Ones are affected" camp)
Something could be up with the actual backlight diffuser in the LCD
A combination of 1 and 2, because the tint is coincidentally localized where the backlight LEDs are
Heresy
I will try and investigate the validity of possibilities 1, 2, and 3 (3 mightn't be by me, because I don't have access to an OPO LCD that can be dismantled). I can't do anything about number 5.
Possibility 1: Backlight Placement
This was explained by a OnePlus team member:
1. Our fans have also brought up a yellow band the bottom of the screen fearing it may be a quality issue. It is not. Since brightness influences color temperature, the yellow tint at the bottom is due to the design of the phone. There are 14 backlights under the screen, which were not meant to be uniformly distributed along the screen but to be all at the bottom. Since we needed to make the screen shorter, the lights were put very closely to the edge. If we didn’t, we’d have a leakage of light.
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We are assuming this is a design characteristic (the "all Ones are affected" camp). I thought the bolded part sounded weird, because if the LEDs were placed further from the edge, wouldn't those 14 visible spots be hidden from view?
Also, after some quick Googling, apparently:
Brightness is a human perception, and luminance is an objective measurement
Brightness ≠ luminance
Color temperature affects brightness, not the other way round
That powerpoint was for entertainment lighting systems though, and it didn't specify whether the brightness and color temperature thing applied to halogens or LEDs.
The HTC One X/XL has a very similar display backlight configuration to that of the OnePlus One. The backlight array starts from the bottom edge, and it also has three backlit capacitive buttons.
The difference is the HTC One X/L's backlight diffuser extends over the capacitive buttons (requiring extension things to provide button backlight), and the OnePlus One's extends over it not as much (those white bits allow light to shine through the capacitive buttons, see two pictures ago).
Also, the back of the LCD is stuck on the chassis, making removal without damaging the LCD very difficult (more difficult than the OnePlus One). This one broke when it was removed from the frame
For this investigation, I'm going to measure the lengths of the screen bezel on the side where the backlight LEDs are (from where the display area ends to the edge of the glass), and from where the backlight diffuser assembly ends to the edge of the glass. Subtracting the second measurement from the first measurement will give us the distance that the backlight has before its light can be seen through the LCD.
Note: the accuracy of the measurements below aren't guaranteed.
OnePlus One
12.94 - 6.63 = 6.31 mm from end of backlight to visible display area
Sony Xperia Z
15.44 - 9.02 = 6.42 mm from end of backlight to visible display area
LG Nexus 5
14.96 - 9.56 = 5.4 mm from end of backlight to visible display area
Motorola Moto G (1st gen)
18.23 - 8.77 = 9.46 mm from end of backlight to visible display area
HTC One M4 Mini
10.81 - 2.83 = 7.98 mm from end of backlight to visible display area
iPhone 5
15.68 - 11.01 = 4.67 mm from end of backlight to visible display area
Apple iPhone 4S
19.71 - 14.12 = 5.59 mm from end of backlight to visible display area
LG G2
10.80 - 5.58 = 5.22 mm from end of backlight to visible display area
I don't think the measurements were very accurate, but from what we've got, the placement of the backlight LEDs shouldn't alter the color temperature of the display. The OnePlus One's placement is on-par with other phones' placement, so those spots may be more of a diffuser problem.
Possibility 2: Under-cured LOCA (Liquid Optical Clear Adhesive)
This possibility was speculated by users, and was not addressed by OnePlus. It has been said that exposing the OnePlus One's display to UV light or sunlight (apparently, 5-10 minutes in UV, 1-2 hours in sun) completes the curing process, thereby eliminating the tint. (will find sources when I have the time, it has also been said that this doesn't fix the tint/band)
Edit: might as well try the sunlight fix. I'd actually have to buy the UV lamps, and wait for them to post. Since my tint is barely noticeable, it's worth a shot. Bottoms up!
Looks like it did make a little difference! (or it might just be my mind playing tricks on me + wishful thinking)
We are assuming this is manufacturing process related ("some Ones are affected" camp). This would imply it is a QC issue, which it is not, according to OnePlus.
Samsung?
It has been noted that some Samsungs may suffer from unevenly cured LOCA. I have yet to see this for myself, but that's not to say it doesn't exist.
By design, Samsung's Super AMOLED panels have no discrete backlight; each individual pixel emits its own light. That's why dark/black images save power, and bright/white images consume more. Due to the nature of OLEDs, blue subpixels age faster than red and green, so the PenTile subpixel configuration aims to compensate for this by having twice as many (but smaller) blue subpixels than the rest. PenTile displays may exhibit a slightlu cool/blue tint as a result. An aged AMOLED display may exhibit a yellowish tint, due to the deficiency of blue.
Every generation has introduced upgrades and improvements to continually improve AMOLED tech. The Galaxy S5 and Note 4's displays finally outshine LCDs of the same class in terms of color accuracy/gamut, contrast, power efficiency, and uniformity of luminance. Sharpness has become increasingly irrelevant, thanks to the 500+ ppi of the Note 4. Any claims that LCD is objectively superior to the current generation of Samsung AMOLEDs is purely subjective. The only advantage that LCD has is its increased durability and lower price. They are less likely to fracture/crack and render the whole display useless.
I will get a phone that does not have a laminated display, and intentionally leave part of the LOCA uncured/under-cured in an attempt to replicate the tint where the backlight LEDs are.
How would this happen at the factory? I'd like to think the curing process involves a conveyor belt pizza-oven like device that "bakes" the display under UV light, but who knows!
We could ask Apple, since their iPhone 4 suffered from a similar problem
Update!: I think I should wear sunglasses next time.
I "only" put it in the lamp for 2 minutes, because that's how long the built-in timer is, and apparently some 20W UV lamps can fully cure a particular LOCA in a mere 6 seconds. I didn't want to risk damage to the LCD, so you could say I "chickened out"...
You can come to your own conclusions about what this means
In all seriousness, my One's probably not the best "poster child" for this, because I've actually heated the screen enough to separate the factory bond with the chassis, and exposed it to sunlight uninterrupted. We'll probably get more visible results by doing the curing process from scratch.
Pictured below is the phone in question; an iPhone 5S knockoff. Most of the better Chinese no-brand/knockoff phones have an OGS display (One Glass Solution), which is already laminated. It is like the OnePlus One's ToL (Touch on Lens), but not. I've posted on XDA before about it!
LOCA time!
As it turns out, the LCD is stuck to the front glass with adhesive tape all around the border. I didn't remove all of it, which resulted in some of the air bubbles to have nowhere to go
Get the display all clean, and apply the glue in an elongated "X" fashion:
I didn't have one of these:
So I used the phone's chassis. Bad idea. The glue leaked all over the place. The whole idea of the alignment frame thing above is to allow air bubbles and excess glue to escape, while also maintaining a uniform thickness between the glass and the LCD.
Lookin' good! This was the best I could make it. An autoclave would've came in handy.
Into the manicure UV lamp for 2 minutes. That should be inadequate enough!
The glue had already solidified enough such that air bubbles could no longer move around freely. The bubble in the top right corner became bigger, but other than that, everything went better than expected!
...or so I thought. LOCA had leaked underneath the LCD and into the backlight, because I used the chassis as the alignment frame, but it did not allow glue to escape.
The glue did not become yellow. It wasn't yellow when it was in liquid form, and I don't have much idea how long you're supposed to cure it for. Maybe it yellows further down the road?
Well, at least the properly laminated areas look great, and glare has been reduced. In hindsight, I should have used a display that could be replaced if I messed up this process.
¯\_(ツ)_/¯
This process is not going well with the Galaxy S3 display
If only I had gotten that $600 machine that make this process a whole lot easier (the frame laminator bit), or the lot for $4,250...
Conclusion?
We cannot come to a definitive conclusion at this point. The backlight placement doesn't seem to result in the yellowing, and neither does under-cured LOCA, since it yellows in a different fashion. Something's probably up with the design of the display itself, and it might have something to do with the color shift you see when viewing it from a different angle.
Either that, or like the touchscreen issues, there might be multiple causes of the yellowing.
Omg man, you deserve the crown of the unofficial Oneplus hardware development.
I'm so lucky to not suffer this problem (but i'm going crazy by the unresponsiveness of my touchscreen).
/p/ says your problem is that your using cannon I' just teasing man, this is an awesome post and we appreciate your efforts.
The complete yellower screen thing is really a color profile(ak has the old one, see the difference)
The tint 92% in the UK
TigerDNA said:
/p/ says your problem is that your using cannon I' just teasing man, this is an awesome post and we appreciate your efforts.
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Well, so is OnePlus
Aaahh said:
The complete yellower screen thing is really a color profile(ak has the old one, see the difference)
The tint 92% in the UK
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So it's not a deliberately warmer JDI display thing?
vantt1 said:
Well, so is OnePlus
So it's not a deliberately warmer JDI display thing?
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The display may have been deliberately designed that way, but changing the colors counteracts anything out of ordinary.
In fact, I like it better than the Samsung and HTC, there screens look colorless or flat. I like my screen, it has depth
Aaahh said:
Samsung and HTC, there screens look colorless or flat. I like my screen, it has depth
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Are you kidding me? Samsung screens are extremely saturated? That's pretty much their thing, over saturating their screens.
TigerDNA said:
Are you kidding me? Samsung screens are extremely saturated? That's pretty much their thing, over saturating their screens.
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The samsung is flat... My friend had the s4 active and I thought it looked depth less.
The HTC is dark
TigerDNA said:
Are you kidding me? Samsung screens are extremely saturated? That's pretty much their thing, over saturating their screens.
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I have to agree here, the saturation on Samsung displays is ridiculous.
Transmitted via Bacon
Aaahh said:
The display may have been deliberately designed that way, but changing the colors counteracts anything out of ordinary.
In fact, I like it better than the Samsung and HTC, there screens look colorless or flat. I like my screen, it has depth
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If we're talking color depth, Samsung definitely has the upper hand over the OPO and HTC.
Aaahh said:
The samsung is flat... My friend had the s4 active and I thought it looked depth less.
The HTC is dark
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The S4 Active had a terrible display. It is not representative of Samsung's better displays.
I wouldn't say HTCs are dark. In fact, the HTC One M8 has a brighter than average display. Some OEM screen assemblies can be complete crap though.
timmaaa said:
I have to agree here, the saturation on Samsung displays is ridiculous.
Transmitted via Bacon
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It's just more accurate/has a wider color gamut that what you're used to on other phones.
Take a look at some of DisplayMate's Samsung display shoot-outs. The Galaxy S5 and Note 4 have some of the most accurate mobile displays on the market (not directly comparable with LCD tech).
He has a fix for that
If you got your one wet, your toast.
Aaahh said:
He has a fix for that
If you got your one wet, your toast.
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We're not here to argue which is the better phone with waterproofing solutions. We're talking about screen quality.
nicholaschum said:
We're not here to argue which is the better phone with waterproofing solutions. We're talking about screen quality.
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That is the reason it's doing what it does
The connection becomes grounded.
Try putting foil around your phone
vantt is here...
Aaahh said:
That is the reason it's doing what it does
The connection becomes grounded.
Try putting foil around your phone
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Yes, but regardless, we're not here to talk about waterproofing your phone.
nicholaschum said:
Yes, but regardless, we're not here to talk about waterproofing your phone.
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I'm done fighting.
I know it might sound strange as light bleeding shouldn't exist on OLED panels; but it's either OLED panels are not perfect, or my Pixel 4 is defective
If I bump my brightness all the way up and look at a dark image (e.g pure black wallpaper) on a dark environment (dark room), you would expect to see no light coming from the panel at all where as if the screen is just turned off, but for my phone that's not the case; I see a slight "light bleeding" like parts of the panel. I don't know if this is some sort of image retention or burn-in, I've always had my phone brightness on 50% or less.
I also had a digging and found out that "OLED panel DOES emit a very little amount of light even when black. As the panel is under current when the screen is turned on"
Therefore I would like to ask fellow XDA users who has an OLED panel for their phone; do you get this on your screen too?
Hi i have the pixel 4 and i have tried with a black image and max brightness in a dark room as u suggested and unfortunately i see the bleeding too.
In my opinion is not something that i would care that much, nobody does something this complex every day, no way i was gonna notice this without your post
i'll try to contact google assistance and ask about this problem and see if they will consider it a faulty hardware or just some minor defects. due to be the first production batch.
bannab said:
Hi i have the pixel 4 and i have tried with a black image and max brightness in a dark room as u suggested and unfortunately i see the bleeding too.
In my opinion is not something that i would care that much, nobody does something this complex every day, no way i was gonna notice this without your post
i'll try to contact google assistance and ask about this problem and see if they will consider it a faulty hardware or just some minor defects. due to be the first production batch.
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Yeah like you said with everyday use it is not something that you will notice, that goes for me too. I only noticed it when I was watching an HDR content in Netflix which the app forces the brightness all the way up for the content.
I hope it is not a faulty thing for the Pixel 4, but rather an imperfection with the OLED technology when the panel is under an electric current
Thanks for trying it out ?