Database Users

Purplish Tint?

I noticed that when I turn my brightness down my phone gets a purplish tint but it goes away as the brightness goes up. Is this because its special type of LED screen or the over saturation of colors?

can you post some pics please?

Normal for AMOLED screens. They tend to get a red tinge to them when they dim down.

staulkor said:
Normal for AMOLED screens. They tend to get a red tinge to them when they dim down.
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Alright I guess the technology isn't perfect yet definently not a deal breaker

I was wondering why the light grey look pink in gmail app

I see it as well. A little annoying, but not a giant problem. The blazing speed of the phone kinda makes up for it.

does anybody of you also noticed this thing: http://www.nexusoneforum.net/forum/nexus-one-tech-issues-bug-reports/1199-amoled-display-issue.html ???

eug89 said:
does anybody of you also noticed this thing: http://www.nexusoneforum.net/forum/nexus-one-tech-issues-bug-reports/1199-amoled-display-issue.html ???
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I did notice this as well. Some of the red pixels on the edges of text seemed to have drifted a little too far from the body of the glyph. I actually thought the same thing as this poster - sounds like they need to tweak their "subpixel LCD text" algorithms to match the different layout of the OLED screen.
I'd add to his analysis that subpixel LCD text algorithms typicall employee adjustments for the non-linear response of the pixels (steps of brightness near the dim end of the scale are not the same perceived size as steps of brightness near the bright end of the scale) and OLED may not only have different non-linear response, but it may have different response in each of its R, G, and B pixel elements...
This all should be tweakable in software and is bound to be improved as OLED screens gain popularity.

Do all the newer/newish Epics/Galaxies have yellow/yellowish displays?

I just got an Epic.
Reading several threads across the Galaxy line, there is apparently a variation in screen color temperatures. From my readings, I see a pattern where perhaps the newer/replacement units have yellower screens. At the same time, those newer units also get darker in auto brightness mode than the older units.
From my own observation, the color temp gets cooler as the brightness increases.
Is it possible that Samsung tweaked the auto brightness so that the phone now gets darker in order to save the battery? So perhaps the different color temp observed are a function of how bright the screen is?
I don't care for the yellowish screen on my new Epic. I like a cooler/colder screen. Comparing the Epic next to my LCD Evo and Touch Pro 2, it is outright yellow. Comparing the 3 phones next to my Nexus One, the N1's screen looks pink. (I can post some pics tomorrow).
Bottom line, I'm trying to decide if I should try to return/exchange the phone for another and hope for the best. I read that there are some potential software solutions out of XDA, but I prefer to have a phone that is natively "cold".
Any input would be great.
Thanks.

Mine's pretty yellow. :-( In brighter light, it is not a problem. Darker screen is the result of a software update. Got mine on launch day.
Sent from my SPH-D700 using XDA App

APOLAUF said:
Mine's pretty yellow. :-( In brighter light, it is not a problem. Darker screen is the result of a software update. Got mine on launch day.
Sent from my SPH-D700 using XDA App
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Thanks for the information. Before the software update, when the screen didn't get as dark, did it appear less yellow at the [pre-update] low brightness?
In other words, does the screen now look more yellow than ever since the update and darker screen?
Cheers.

I got my Epic on Oct 1st, and I haven't noticed this yellowish at all, but maybe I need to do a thorough side by side with an older model?
Did you get any pics to post up yet? I'm interested to see this
Edit: Sorry, just saw you said you can't post pics until tomorrow.

snovvman said:
Thanks for the information. Before the software update, when the screen didn't get as dark, did it appear less yellow at the [pre-update] low brightness?
In other words, does the screen now look more yellow than ever since the update and darker screen?
Cheers.
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Just as yellow as always. Post-update, the screen dims more. At this point, it appears yellower. My Captivate also now dims more, post-update, and seems bluer at dimmest setting.
Sent from my SPH-D700 using XDA App

The only time I've had problems with my screen was when my phone had gotten damage from water. I'm on my 2nd epic and this one doesn't have any yellowish tints. Only about a week old now.
Sent from my SPH-D700 using XDA App

I picked up my Epic on 9/29 and don't see any yellow tint at all. I'm not an expert here but I think I would notice a tint like that. My blacks are very clear and dark also. I did notice that it seemed to run on auto brightness a little darker than it had...that was probably the D-118 update after I had it for only a few days.
I will follow this thread and see where it goes.

I don't think the screen color variation is based on release date. I have two of them since 8/30. One of them has a yellowish tint compared to the other. They both have the same DI18 update.

It seems like a coin-toss what screen color comes. I wish we have a tool that would allow easy color temperature adjustment.
I read a thread about a way using a modified kernel, but it would be nice to have an .apk that works (even if it requires root).

I got one on launch day that had more of a blue tint to it. I got another one last week that was a refurb, and it definitely is more yellow.

Weird. I just got mine today and it's very cool (read: blue) compared to my Evo... being a photo guy, this drives me nuts. I prefer warmer diplays.
Sent from my SPH-D700 using XDA App

I have one of the cooler screens, and I kinda like it.
My thoughts:
1) Samsung is trying to extend the life of the blue oLEDs by altering the color temperature of screens. Since this seems to be happening independently of ROM version, it's probably something they're doing with firmware.
2) (IMO More Likely) The screens on different phones came from different assembly lines or different production runs, and have a slight variance in color production. The production date of the phone wouldn't necessarily matter in this case.
The only project I know that deals with the color temperature of the screen is voodoo:
http://project-voodoo.org/color
I currently have it running on my ROM. It adds a new "very low" brightness setting a the bottom that's much dimmer than even the lowest one available in DI18. (Note: it doesn't interpolate levels between them, either. Meaning there is a big jump in brightness from the voodoo lowest level to the DI18 lowest level, which is the next "notch" up on the slider.) It also adds a brightness level at the very highest brightness, which noticeably makes the display warmer. (The highest and next-to-highest brightness notches are the same brightness, the difference being the highest one is warmer.) At this point of its development, it's really of no use if you want to make your screen warmer at all brightness levels.
At any rate, the project leads me to believe that, with further development, we could have an app that allows us to freely change all the color settings for the display for all brightness levels, save them to profiles, etc.
The idea of the screen getting warmer as you decrease its brightness might be a natural phenomena, or just perceptual. In my experience, colors usually seem warmer as you decrease the intensity of the light. This is even true of light on a physical object.

My screen looks awesome. No yellowing or anything. I wonder if there is a difference based on who made the screen for that particular Galaxy S phone? I remember reading an article when all the Galaxy S phones started rolling out saying that Samsung was having trouble with the manufacturing of the AMOLED screens. Perhaps they started cutting corners.
However, there also seems to be issues with auto-brightness, etc...I have that disabled on my phone and the brightness set on its lowest setting (which is plenty bright for me and all my viewing needs) which may be the difference? But, I have cranked it up from time to time just to show others and I still don't notice any yellowing.
Is there a specific test image or something where one could view that would show/exaggerate the effect people are talking about? I would be curious to see...

Thanks for the great input and information.
Here is something interesting for the Nexus One screen.
http://forum.xda-developers.com/showthread.php?t=745248

Never noticed any of the sort.
Forgive My Brevity. To Be Or Not To Be...

I havent noticed it either. Had mine since day one
Sent from my SPH-D700 using XDA App

http://forum.xda-developers.com/showthread.php?t=745248
Should help in this case once Froyo arrives

Here is a quick picture taken by a Touch Pro 1. Sorry about the quality. I can try to take better ones if there is interest.
From left to right - Evo, Epic, Nexus 1, Touch Pro 2. All with auto-brightness on.
In real life:
The Evo looks whiter (cooler)
The Epic looks much yellower (warmer, almost greenish)
The N1 doesn't look as pink as it appears, but looks the darkest
The Touch Pro 2 looks the whitest (coolest)
To my eyes, the Evo/Touch Pro 2 looks good. Although the picture shows the Epic looking pleasant and only slightly warmer, the white elements (clouds in wallpaper, browser backgrounds etc.) look yellow/green.
Edit: Notice the Menu, Home, Back, Search menu LEDs look whiter than the screen. See the contrast between the two makes the screen look yellower.

I've owned 3 Epics since launch day. First one had a good screen, 2nd one had a yellow tint, 3rd was perfect.
The build dates of the first 2 were 10.08 and my current one is 10.09.

arashed31 said:
I've owned 3 Epics since launch day. First one had a good screen, 2nd one had a yellow tint, 3rd was perfect.
The build dates of the first 2 were 10.08 and my current one is 10.09.
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By perfect, do you mean that it is not yellowish? It's interesting that the first two phones with the same build date has two different color screens...
The Epic I have has a 10.10 build date. It's yellow at dimmed levels and color temp gets cooler as it brightens up.

2.3.3 color change

I am looking for honest opinions about the color change to the Nexus S display with the 2.3.3 update. I have heard very many people complaining and not liking the new color scheme. THis is key to whether I allow my nexus to update or not. If anybody can give me any opinions regarding this I will greatly apprectiate it. Also, what exactly was wrong with the original color scheme to begin with?

I've been lurking for a while now, but I suppose it's high time that I start contributing around here!
I think the update's colors are fine. Breaking it down, the 2.3.2 and below colors were a bit reddish in my eyes. While you couldn't tell for the most part, if you use a program like Screen Filter and get the screen to be very dim, there would be a very purple tint to the screen.
The update removed the purple tint, but a lot of people (the ones you refer to) began complaining about a yellowish tint and washed out colors. The yellowish tint is noticeable, especially when I compare white between the Nexus S and either my computer or an iPhone 3GS. In my eyes, it's not *that* yellow, and the screen overall looks better than it did pre-update. The washed out effect I really haven't noticed, though I do think that after installing netarchy's kernel, the colors do pop a little bit more.
Overall, I'm not a terribly picky person, but I do think that 2.3.3+Voodoo color looks better than 2.3.2 or stock 2.3.3.

Jeff's right. 2.3.3 stock colors aren't bad at all. I actually like it over the purplish colors of 2.3.2. Plus I think the lowest brightness levels have been darker than 2.3.2.
Sent from my Nexus S using XDA Premium App

You can't compare your super amoled screen to a computer monitor or an iPhone. When making this kinda comparison, you should compare with another similiar galaxy s phone or N1 that doesn't have the purplish tint issue. With that being said, the reason why colors looks washed out to some after the update is because, before the update most of us was used to the grays being purple so alot of images that had this certain shade of gray would display purple. Now after the update, those images that we're used to looking at with the purplish issue are now all of a sudden displaying it's true color of grays, which causes the images to appear washed out. The update does provide the correct color calibrations. Also keep in mind the these screens are not consistently manufactured the same. So even tho the update provides the correct color calibration, the outcome still may vary depending on the condition of the manufactured screen which explains why some are experiencing extreme yellowish discoloration.
Sent from my Nexus S

my brother bought a nexus S used few days ago. it was on 2.3.2
on high brightness, the white was perfect white " no yellow tint on it. perfect white.
however on low settings, it used to have pink tint that is more clear on gray colors.
so he updated to 2.3.3, the pink is gone. but now the screen has this " yellow " tint to it that makes the creen looks washed out. the blue not really a blue . its lighter blue, and the white on high setting is like yellow white.
however, he updated the karnel i think with one from voodoo where he can pick between 2 color profiles " forgot the name of the karnel but its in xda "
now the screen is back to how it was on 2.3.2 with its white " no yellowish" and when he pick the color profile for the low settings, the pink is also gone . no more pink on low settings and yellow on high settings. its actually perfect.
i assume if your phone has yellow issue on 2.3.2, then you are probably screwed. as there is no fix to that. the voodoo will only return the white to how it was on 2.3.2
but if your white was perfect and you have a problem with the pink, then look for the karnel, you will lose your pink plus the perfect white will come back agian

[Q] Yellow Tint & Brightness issues (again!) - Why??

I know there are other threads that discuss this topic (somewhat) but I wanted to post this separately because what I'm asking is very specific.
I've had about 8 separate Nexus devices from Google Play in the UK and every one of them has had the same issue:
The display has had a noticeably yellow but admittedly slight (possibly slightly brighter) tint on the bottom and left edges, while the right edge has been dull/dark.
This is specific because there are other and numerous reports of a yellow "tint" across the whole screen. This is not the whole screen, this is very clearly just the bottom third and left edge of the screen.
Some think that this is a "glue" issue that will resolve itself. Some think it won't get better. Some think that it's an issue they can live with. Some can't stand the lack of uniformity.
Well I can't stand the lack of uniformity because in my opinion, on a 4.7 inch screen, I find it distracting to be reading text on a solid background or white and the "white" or background colour changes as I read right to left or top to bottom. I consider a decent amount of uniformity to be a minimum requirement for devices which will be used in the way most of us use our phones and tablets. Manufacturers, seemingly, don't care at all except in the most extreme of cases. It looks like they are churning out whatever they can get away with. In all other aspects, the N4's screen is fantastic.
There's nothing anyone here can really do to help directly but it leads me to a question I haven't been able to find the answer to anywhere by Googling or searching other forums:
What is the cause of this lack of uniformity on these LCD panels? It seems to be LCD specific. As mentioned, some think it's "glue" but then others say not and in my experience the tint issues haven't gotten any better in the time I've had the devices that have passed through my hands.
I don't think it's the LED backlighting but could it be something to do with that?
Does anyone know, from a technical point of view why LCD panels are so prone to this issue with the yellow tints across *part* of the display. It's a very widespread thing as it's been noted on most of the iPhone range and a lot of other handsets too. Is there something inherently difficult for panel manufacturers (in the N4's case, LG) to do to make the panel evenly toned and lit? Surely it can't be that hard at this stage in the development of LCD tech once the manufacturing process is "calibrated" at the factory and underway? I assume these handsets are assembled by robots, not by hand. Is that right? Why is it so widespread? Is it a cost issue? Would I have a better chance of a quality panel by buying a more expensive handset? (Although I've seen many HTC One X's with the same problem - I did see one which was almost literally "perfect" in uniformity and brightness). I'd really appreciate any feedback on this. I know that because it's the "norm", sadly, the common response is to now "accept" the panels and handsets that are out there. There doesn't even seem to be a "higher end" manufacturer where high quality uniformity is more likely - or is there?
Anyone with a good/strong knowledge of LCD tech or the manufacturing process out there that can explain this?
Thanks!
***UPDATE***
I've now attached an illustration to show what I mean. ***It's exaggerated a bit*** to show the effect but illustrates the problem clearly.

Have you tried using a custom kernel to tweak the colors of the screen? The Nexus 4 is known for it's washed out colors so using a custom kernel like Trinity or Franco kernel allows you to tweak the color of the screen to your desire. Of course you will need an application to tweak the colors.

LG is known for light bleeding and or panel uniformity issues, I had to swap 4 LG tvs before I decided to go with Panasonic , my LG ips monitor that im typing on right now for my pc has light bleeding in some areas which results in low contrast. I saw about 13 different optimus g devices before I got the nexus 4 and the screens are beautiful with good contrast, punchy colors and good black levels with no light bleeding or weird tints while my nexus 4 has slight light bleeding right where the signal bar is located. I love this phone and its seems to get the " perfect " one you maybe have to swap a few times and to me the price kind of fits the quality of the phone but then I almost have enough spare cash to buy another one lol can't complain about that.

demorik said:
LG is known for light bleeding and or panel uniformity issues, I had to swap 4 LG tvs before I decided to go with Panasonic , my LG ips monitor that im typing on right now for my pc has light bleeding in some areas which results in low contrast. I saw about 13 different optimus g devices before I got the nexus 4 and the screens are beautiful with good contrast, punchy colors and good black levels with no light bleeding or weird tints while my nexus 4 has slight light bleeding right where the signal bar is located. I love this phone and its seems to get the " perfect " one you maybe have to swap a few times and to me the price kind of fits the quality of the phone but then I almost have enough spare cash to buy another one lol can't complain about that.
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Thanks for the reply. I've heard elsewhere that LG specifically seems to have poor quality panel uniformity. I think LG panels are used by Apple who have had many, many reports of panel yellow "tint" issues on both their iPhone and iMac range. It seems to affect screens big or small. Having said that, HTC had similar problems and their panels were manufactured by Sony. I would *love* to know what's causing this or what is the reason for the yellow "tint" issue on part of the screen.

scream4cheese said:
Have you tried using a custom kernel to tweak the colors of the screen? The Nexus 4 is known for it's washed out colors so using a custom kernel like Trinity or Franco kernel allows you to tweak the color of the screen to your desire. Of course you will need an application to tweak the colors.
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I have done all of that and with some success with all of the handsets I've had but because the tint affects only part of the screen in a sort of gradient - the calibration cannot fix it.
I'd much prefer a screen that had a yellow "tint" evenly across the whole screen then of course I could calibrate accordingly.

alsheron said:
I've had about 8 separate Nexus devices from Google Play in the UK and every one of them has had the same issue:
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You've had 8 different Nexus 4's?

yellow patches is from the glue used in the optical lamination process, yellow tint is from the display calibration which is often used to reduce banding and gives more saturated/warm look to colors
if your device is affected by by visible yellow patches the only cure is to re-calibrate the display to reduce the effect and don't get the device too hot as it may increase it

DynamicRam said:
yellow patches is from the glue used in the optical lamination process
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Not that I don't believe you, but could you link me to the source of this theory?

DynamicRam said:
yellow patches is from the glue used in the optical lamination process, yellow tint is from the display calibration which is often used to reduce banding and gives more saturated/warm look to colors
if your device is affected by by visible yellow patches the only cure is to re-calibrate the display to reduce the effect and don't get the device too hot as it may increase it
Click to expand...
Click to collapse
Sorry but this is not what my OP is about. I do not have a uniform tint and therefore it cannot be to do with "calibration" of some sort unless I am mistaken. Neither do I have "patches" or "spots". This is very specifically about a gradient yellow "tint" that only affects part of the screen and trying to find out the technical reason(s) for its prevalence in a wide range of LCD screens used in mobile phones and of course the Nexus 4 in particular. I've updated my original post to include an illustration of the effect I'm asking about. Thanks!

I am pretty sure its a hardware fault and i assumed you tried to return it otherwise there is nothing else you can do so i suggested calibration to reduce the effect

I had the same issue, then flashed custom ROM and it was fixed. Go figure :silly:

stevenhw8 said:
I had the same issue, then flashed custom ROM and it was fixed. Go figure :silly:
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hi stevenhw8, can U give me name and link to download your custom ROM? thank you.

Screen tint and viewing angles questions and opinions please

Ok well I would like to get peoples feedback and opinions on their screens.
My story. Broke my GNote II instead of paying to replace LCD decided to upgrade with my carrier.
First Note 3 I bought was bright with nice whites and great viewing angles. But it has the dreaded pinkinsh purple screen tint issue in the lower 3rd of the screen more so on the right side. This is subtle and is less evident in brighter conditions or higher screen brightness. At low brightness and in dark environments it is particularly visible on white and grey backgrounds. Went to store to exchange and they refused given they could not see the defect. I came online here searched around and it seems this has been an issue on the GS4 and people have mentioned it on the new Note 3.
Convinced my carrier to send me a replacement and I will return the original to them. Well got the replacement 3-4 days ago. The unit seems quite different. First off the screen is overall a bit more yellow at face on viewing angles and perhaps a hair less bright at similar settings though hard to tell. The bottom is not color shifted puple. The screen color is more homogenous. However the viewing angles are completely different. Here while the brightness stays goo dlike the first when angling the screen, the colors shift to a more aqua color with minor angle variation. (guessing 20-30*) whereas the original unit has virtually no color shift at almost 90*.
I probably have to send back a unit in the coming day or 2 and make a final decision. In theory I could try to ask for a third model, however it was with a lot of difficulty and threats to leave my carrier that they relented in the first replacement. SO I likely will have to stick with one of these or return both and use my somewhat broken note 2 and wait for something else.
I am wondering if any of you out here have similar pink/purple tint issues at one end of your screen. Or if you have issues with significant white color shift when angling your screen more than 30* in either portrait or landscape. Also if good or bad can you check build date on your phone (should be under battery). FInally did you or will you replace it? Was replacement better or worse?
Also if in my shoes would you go for the better looking screen with the pink issue or the more consistent looking screen that is a bit more blue yellow.
Thanks!

lots of postings about this, i even made a thread regarding this:
http://forum.xda-developers.com/showthread.php?t=2463786
some people call it nitpicking, but as you can see i'm feeling with you...

TML1504 said:
lots of postings about this, i even made a thread regarding this:
http://forum.xda-developers.com/showthread.php?t=2463786
some people call it nitpicking, but as you can see i'm feeling with you...
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I know you did and I posted some long posts there and the thread kind of died.
I have some specific questions here as well as asking what I should do in my case.
I had a note 2 and remember there being perseus kernel and with STweaks one could shift color etc and make it how you like. I am thinking going with the more uniform color model as I am sure the slight yellow tint can be corrected and the blue tint on viewing angles is no worse than my note 2 looking back so I will get used to it I imagine. That said the first screen really has great screen but the purplish pink right bottom corner bugs me on white and grey screens ( not noticeable on high brightness though) and often reading on websites etc indoors I notice it enough that it bugs me.....

So for anyone who cares here is an update on my plan. The more uniform note 3 is more yellow/green tinted whites compared to the other one that is whiter/redder. That said if I use one of these screen filter style apps that exist in the play store, I can modify the overall screen into however I like.
Downside is that it means a persistently running app to do it with whatever effect on screen longevity and battery.
Now on my Note 2 which is also yellower, I was running perseus kernel and the s tweaks app and was able at the kernel level to modify the color to get better whites. I imagine it is only a matter of time before someone can do that for our note 3. I can handle the viewing angle color shift as the device is in my hand and not on a table when i use it where it might be off angle viewing by a large amount. And even then, the tinting of white has a bluish shift and now worse than a yellowing shift my wifes iphone has off angle or my note 2 did.
Would love tohear from others and what their screens are like and or developers who might have the means of modifying color at kernel level the way Andreilux did on the note 2

I checked almost 10 note 3s bkack n white as well..and found only 1 set.it has no yellow tint and no gray lining.

nabilsweet007 said:
I checked almost 10 note 3s bkack n white as well..and found only 1 set.it has no yellow tint and no gray lining.
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You checked 13 notes and 12 of them were either yellow tint or what gray lining issue?
How did you manage to check so many.
Can you check the following. Look at the phone screen face on the tilt either up down or side to side about 30 degrees and tell me if the white on the screen turns bluish.
One of my phones does this and has the yellower whites. The other does not and has better whites but has some purplish discoloration in the lower right part of the phone.

Any one here try a new kernel from the android development sections?
Some of them talk about being able to modify screen color. Am wondering if this can be a fix for my issues.