yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab 7.7 General] Richdog:
This really interests me. I hope that someone can make an app that forces 24-bit colour system-wide... maybe its something Chainfire could add, who knows. Either way im sure it would dramatically improve things.
[Galaxy Tab 7.7 General] EarlZ:
ICS should be able to give us 24bit system wide, or so I am lead to believe.
[Galaxy Tab 7.7 General] jawil:
Agreed! This app shows that it's a matter of specifying the right setting in the app to get access to 24-bits of color. My therory is that the developers of apps choose the 16-bit setting as a safe default to be sure not to break anything.. :| The warnings in the app when selecting 24-bits is a sign of this..

---------- Post added at 01:34 PM ---------- Previous post was at 01:32 PM ----------

Well, the S2 has the same issue. And upgrading to ICS on the S2 didn't change anything as far as I have noticed. For example, you still have to force 24-bit settings in the LWP i mentioned above to get rid of the banding..
[Galaxy Tab 7.7 General] EarlZ:
LWP is an exception as a higher color depth may impact performance, how about the menu screen from angry birds, what one always showed massive banding on GB based devices but non on the Galaxy Nexus.
[Galaxy Tab 7.7 General] prinzhernan:
I guess Samsung forces 16 bit and not Google? Because ics with the s 2 still shows banding.
[Galaxy Tab 7.7 General] EarlZ:
Not sure because the Galaxy Nexus does not have any color banding.
[Galaxy Tab 7.7 General] Richdog:
Hmm, so i guess based on this (relatively limited) info we could maybe assume that either Pentile screen tech doesn't suffer banding at lower colour depths, or that the Qualcomm chipset/GPU drivers in the Nexus are just configured differently than the Mali-400MP in the SGS II and 7.7?
[Galaxy Tab 7.7 General] teiglin:
Not sure how likely it is to be a driver issue, but just a minor correction: the Galaxy Nexus SoC is produced by TI, not Qualcomm (with GPU by PowerVR). :P
[Galaxy Tab 7.7 General] Richdog:
Yeah its OMAP, brain fart on my part, however principle is the same. :p
[Galaxy Tab 7.7 General] oneee:
My 7.7 finally arrived after to weeks of waiting for reparation of the rings problem. Here it is.... se for yourselves.
[Galaxy Tab 7.7 General] EarlZ:
That is just horrible!
[Galaxy Tab 7.7 General] emprize:
have u tune the photo's contrast or anything?

if this is the original photo, it really serious, u should return it
[Galaxy Tab 7.7 General] prinzhernan:
Oh my god. What happened to that screen??
[Galaxy Tab 7.7 General] oneee:
No you can't see it like the photo. I took the picture with my camera using iso800 just to show you whats is going on in the screen. But its worst then before yes....
[Galaxy Tab 7.7 General] EarlZ:
Mine looks something like that and I believe almost all screens look like that when certain shades of colors are used.
[Galaxy Tab 7.7 General] jawil:
If you can't see it, why do you care? All the tabs are like this. I have used my tab in total darkness and I've never been able to see these rings. Enjoy the tab and calm down.
[Galaxy Tab 7.7 General] oneee:
When i say i can't see it like the phostos doesn't mean it's not there. Its visible for me with some colors, especially with grey even in day time and its bother me everytime i see it. Maby you Don't care well i do, thats why i am here. Why are you here? if you dont have problem. I dont think all tabe is like this. check my preview post that uploadet photos of my first and second tabe they are not the same.
[Galaxy Tab 7.7 General] EarlZ:
It can be seen, its not a totally black picture taken with a high exposure. I can also see those rings on my screen in daytime usage, some are not as bad as others but I believe almost all of the screens suffer from this rings/dots. At least here in XDA-Developers no one has posted a photo yet that it does not suffer from any of those.
[Galaxy Tab 7.7 General] Richdog:
I should be buying a new camera today, so will test on my own device. Ive never seen any rings in either night time or day time usage.
[Galaxy Tab 7.7 General] EarlZ:
if you dont see it normally dont look for it?
[Galaxy Tab 7.7 General] pikulu:
Guys at what brightness are the rings visible?how does the screen look at 100% brightness?Is there any uneven brightness found even too at max brightness?
[Galaxy Tab 7.7 General] EarlZ:
Depending on what is on the screen, they can also be seen at 100% brightness on mine, the uneven brightness is only noticeable in shades of greys, browns, yellows and blues or when you watch animated films.
[Galaxy Tab 7.7 General] pikulu:
So this seems like moving to the new ipad's retina looks a better option ! !

Atlest whatever may be the problem with ipad,they wont be that horrible like tab 7.7 and plus real life looking colour sauration,and for samoled fans,a NOTE is always there,or may be a s3 :D
[Galaxy Tab 7.7 General] EarlZ:
The Ipad3 also has its share of screen issues but most of then can easily be seen on the store before finalizing your purchase.
[Galaxy Tab 7.7 General] muttleyuk:
I have exactly the same problem on my unit. It's noticeable for me when watching a movie in the dark. It's really distracting.

One of the main points of these screens is that it has excellent contrast. I'd take a slightly greyer uniform screen over a very black one with rings all over it any day. :mad:

It's only noticeable when ambient light is practically zero, but looking at it in a dark room looks terrible whether on min or max brightness. I can't take a photo of it as I don't have a good camera but it looks like the attached file.
[Galaxy Tab 7.7 General] aridoasis:
i got my tab 3 days ago and decided to test this out. i used one of the sample images for testing. i had to set brightness to 0 in the settings, and in addition, used the screen dimmer app and brought it down to 20-25% before i could see the rings. since this is the case, i'm not really bothered by it since i'm never going to use the tab at that brightness anyway.
[Galaxy Tab 7.7 General] EarlZ:
Mine can be seen at 100% brightness with a well lit room, what test image are you using?

Ive attached some test images where it can be easily seen, there are countless of instances I have seen the circles on my device with my normal use.
[Galaxy Tab 7.7 General] Richdog:
Just tested in darkness and in sunlight at 0% and 100% and I really have no rings on mine using the test screens you attached.
[Galaxy Tab 7.7 General] EarlZ:
Then thats great! Its quite rare to find a screen with out rings or any hint of discoloration on the edges.
[Galaxy Tab 7.7 General] aridoasis:
Just tried your images in a dim room at min brightness, and i can't see the rings.

But, using screen dimmer app to bring the brightness even lower, then i start to see them - same as with the previous experiment i did.
[Galaxy Tab 7.7 General] aridoasis:
Ok, i tried Earlz's images again, and this time in a dark room. Yup, i can see the rings at min brightness (withiut using screen dimmer). Bumping brightness up to 25-50% and i can no longer see the rings.
[Galaxy Tab 7.7 General] Richdog:
Oh, I do have some discoloration, but only on grey colours, and very mild. Certainly no biggie for me.:)
[Galaxy Tab 7.7 General] EarlZ:
I have the discolorations which is very visible in greys but also very visible pictures with a lot of single color area's or animated films and anime which is very annoying, I'll be returning the tablet this weekend.
[Galaxy Tab 7.7 General] biopsin:
I have also the black rings and lined texture thing issue..
[Galaxy Tab 7.7 General] scottyn:
can see the rings too. Doesnt affect usability at all. Wouldnt have even noticed it if i hadnt read this thread first
[Galaxy Tab 7.7 General] biopsin:
well i noticed this first day of use..guess ill return this and wait another year..
[Galaxy Tab 7.7 General] donkuok:
For those who having issue, were those made in Korea or Thailand. I have a made in korea version and does not have these ring and dark spot issues.
[Galaxy Tab 7.7 General] biopsin:
dunno, first 3 numbers from the 2 printed ean codes start with 351 and 880.

mind telling how to spot the difference?

funny thing, the screen has bin on what a total of 2 hours and already the statusbar is burned in!??
[Galaxy Tab 7.7 General] admiez:
I really like the brightness and color reproduction of the screen. However, after minimal use, it already has noticiable discolouration (burn-in) along the two edges where the status bar is usually showing. That, is dissapointing.
[Galaxy Tab 7.7 General] mikahakk:
10.1 did that too. Superglue in the edge fixes it easily. Seriously!
[Galaxy Tab 7.7 General] Po0yAn:
Guys take a look at this:

http://xdaforums.com/showthread.php?t=1683483

Seems sgs3 may suffer from the same problem too. What the hell is wrong with Samsung,s QC?

NeXusS i9020T - Slim ICS V3.8 - Matr1x V19.5
[Galaxy Tab 7.7 General] plastikuss:
But how do you put superglue without getting the surface of the glass glued too? Could you explain?
[Galaxy Tab 7.7 General] zsolti256:
Whatever he answers I wouldnt play with superglue. . .
[Galaxy Tab 7.7 General] esthreel:
I just bought the tab yesterday, and I was shocked to see those circles and dots. But after a bit googling... and this thread. I am not sure should I bring it to a service center. The backlight is pretty even, ant the white seems to be OK, no dead pixels, and yellowish grays only on certain shade.

I love using my tab, before I go to sleep, and playing Osmos those circles are are visible, like you want to clean the screen or something :D. Also in the darker images, menus. The circles become non visible at about 30% brightness, but its not comfortable to look at in the dark.

tl;dr Bought a new 7.7, has circles and dots, everything else is OK, should I bring it for repairs?
[Galaxy Tab 7.7 General] zsolti256:
I saw it too, i have it too , probably all of our tabs have this, but i dont think it is an issue, remember This screen is pretty much the cutting edge of tablets. . .

So if this is the only compaint so be it.
[Galaxy Tab 7.7 General] plastikuss:
I think all tabs has the circles, if you exchange they will give you another one wih the circles
[Galaxy Tab 7.7 General] dfkt_:
Yes, seems so. I had my 7.7 sent in for repair because of the annoying circles (and one stuck pixel). The new screen I got still has similar circles (but at least I don't have a bright green pixel in the middle of it anymore). Ah well, it is really annoying when watching movies at night, but since there's no real alternative for my needs, I guess I have to live with it...
[Galaxy Tab 7.7 General] aletheus:
My screen is perfect. I'm an artist and have quite an extensive background in color theory, metaphysics, optics and philosophy of mind---and working on an MFA in studio painting.

I got this tablet because of the contrast ratio, pixel density, expanded color gamut, etc....

Point being: I'm VERY picky about display quality when it comes to digital image rendering and if i'd had ANY of the problems you've mentioned, I would have returned the device. Had I not been lucky and gotten THE perfect screen, i'd have returned it and waited for a TRUE production-level device. Keep searching!!! An A+ example of this technology is WELL worth the time finding the right machine. I'd say go for it, no matter how many units you have to test, and don't relent when sales reps look at you funny.

Peace out and good luck!
[Galaxy Tab 7.7 General] aletheus:
Not all screens have them. Mine is PERFECT.
[Galaxy Tab 7.7 General] Po0yAn:
The tabs are made in either Korea,china,and Vietnam, which one is yours?

NeXusS i9020T - Slim ICS V3.8 - Matr1x V19.5
[Galaxy Tab 7.7 General] aletheus:
How do you tell? I got it from an importer. I'm in the US. Original (not stock) rom looked like it was from thailand. CSC=TGY. But I don't know how to tell from a system dump or even a dmesg call. Curoous to know though if anybody can tell me what to look for.
[Galaxy Tab 7.7 General] plastikuss:
ok, so 99% have the circles, the others don't.

:-)
[Galaxy Tab 7.7 General] aletheus:
I meant how do you discover what factory your device is made in? Not how do you tell if your screen has blemishes....I could do that on my own....
[Galaxy Tab 7.7 General] Po0yAn:
I don't remember exactly, it was 3 months ago, but I think for me it was written on a barcode stock on the box.

NeXusS i9020T - Slim ICS V3.8 - Matr1x V19.5
[Galaxy Tab 7.7 General] esthreel:
Mine says on the box:

Made by Samsung, Korea.

Country of origin China.
[Galaxy Tab 7.7 General] Po0yAn:
do u have the circles and ink spots?

NeXusS i9020T - Slim ICS V3.8 - Matr1x V19.5
[Galaxy Tab 7.7 General] paulikxp:
Same here!
[Galaxy Tab 7.7 General] dfkt_:
You guys just didn't look hard enough... ;)
[Galaxy Tab 7.7 General] uze:
Exactly. Rings are only visible in complete darkness, on a dark background and at the lowest screen brightness. Many people do not notice them. If anyone thought that they do not exist, then by chainfire3d let them set their own night mode, such that the sliders on the color scale were in the middle or lower. If the artifacts do not come out, the screen is actually perfect, but it probably is not possible at AMOLED, just different screens are backlit, so you do not have such deep blacks and contrast, but so similar imperfections not visible. I have three AMOLED screens in a variety of devices and all it has.

Wysyłane z mojego GT-P6800 za pomocą Tapatalk 2
[Galaxy Tab 7.7 General] Josvaz:
Simple to see do it before u sleep, off all lights then shut down yr tab tab while staring at the screen. U wont miss it.
[Galaxy Tab 7.7 General] aletheus:
Mine is actually absolutlely perfect. Someone else on the other backlight artifact thread said their was too. Thank the gods, I'm an artist and got this as a digital sketchpad...if i'd wound up with artifacts like that, i'd have returned the thing.
[Galaxy Tab 7.7 General] plastikuss:
This is a normal issue, if you don't have it probably you have a defective unit and I suggest you return it and take another one...

:)
[Galaxy Tab 7.7 General] aletheus:
Wait, your telling me if my screen, in pitch black-with a total black background, DOESN'T produce cirular burnout artifacts then my tablet's defective? If it had them it would be unusable to me.
[Galaxy Tab 7.7 General] zsolti256:
I can only see the circles at night when turning it off, or using Screen filter from the market, and taking brighness way down than factory minimal, on dark backgrounds such as the setting menu.

I too think if you havent seen it , you dont know its there :)
[Galaxy Tab 7.7 General] slide200sx:
Hi All,

I bought mine about three weeks ago, had no issues with it as mentioned above at all, though I will say depending on the background colour when opening the menu at the bottom clock my screen will change brightness on its own (even more so with a white background) its as if the darker menu bar gives the rest of the screen more power or something.

Regarding the screen circles, having worked at a windscreen / glass manufacturing plant I know all about the circles and how they are caused, when the screen is mounted or moved they are using a suction handle as not to mess on the screen and this after time can leave an impression on the glass, which is only seen at some angles or light conditions.

I hope this helps someone, and again I have no issues with mine bought beginning June 2012
[Galaxy Tab 7.7 General] muttleyuk:
That's an interesting thought about the suction cups, I would never have thought of that!

I sent mine in to Samsung and they sent it back saying they couldn't replicate the problem. It's going back again.
[Galaxy Tab 7.7 General] aletheus:
Alright, I FINALLY noticed... what I figured out was the only place I could find that was PITCH black was my closet. On shutdown and when I have a TOTALLY black screen and hide all my menus and pallettes, there it is, like some netherworld staring back at me.

Samsung is saying its not there. And I draw on black screens all the time. As in, its ability to produce black and it being brighter than a laptop screen (not all, but any I could afford) are why I bought this. But its just not noticeable once there's one iota of light from the display, or from the environment. Its still totally workable, as in, if i percieved it while I was working, i'd be bothered by it. If it interferes with your work i'd want a refund.
[Galaxy Tab 7.7 General] baduus:
Hey, just checking in on this thread with an update.

When I bought my 7.7 back in February I also had very obvious yellowish discoloration near the bottom of the screen.

So last week, I finally RMA'ed the tablet due to this issue.. I wanted to wait in order to increase my chances that Samsung had sorted out their AMOLED production problems.

I just got it back from the shop and the new screen they installed is MUCH better than my old one... there is almost no trace of yellow discoloration near the bottom, and only very very slight hint of discoloration near the top - almost perfect.

I also haven't noticed any of the suction cup marks others have mentioned, but I haven't really gone looking for them, and never noticed them even on the old screen.
[Galaxy Tab 7.7 General] 九千.:
It is good to know that, such that anyone having a unit with uneven yellowish discoloration could ask for replacement before warranty.

For the suction cup marks, it would be rather difficult to spot at the center unless they turn off the light. XD
[Galaxy Tab 7.7 General] samaliset:
Screen brightness

Hello,

I got the p6810 a few days ago and I did notice the screen brightness changes when it is tilted, from clear white to bright grey, in bogh positions, up and down.

Som thing else redgarding the screen too, when I go to setting, the screen lags a bit and durinb that very litle time, a very clear light (like a spot light) chines up from the left side in portraite position. This to md appears upnormal. Any ond noticed that ghjng?

I'll wait again some time, until ICS out there to see if this will disappear.

Thznkx for your help

I could screenshut the problem I mentioned above, in case anyone has or how tosolve it.

Thanks
[Galaxy Tab 7.7 General] miyako:
Hi! Just wanna ask regarding the adjustment of the brightness. I just notice that when I slide it to 0% it still strain my eyes when I am in the dark room. Meaning it is still bright for me. To compare it to my iphone 4, the 50% brightness is darker already than my 0% tab 7.7. Is this the nature of the 7.7 (P6800)? or my screen is defective? how dark can you get when on 0%?
[Galaxy Tab 7.7 General] ThE_SoUrCe:
it's normal, dimmest setting in amoled is still crisp and bright, compared to Apple's screen, wherein you can set to to 'SUPER LOW" that it may strain your eyes more, (like trying to read newspaper in a candle lit room)
[Galaxy Tab 7.7 General] miyako:
Oh i see thank you for that. :-$ :D
[Galaxy Tab 7.7 General] kishd:
You can get the screen slight dimmer by setting ro.lcd_min_brightness to 0 in the build.prop file.
[Galaxy Tab 7.7 General] samaliset:
I am back to you on this subject since I have just got a new device from Panamoz (P6800). In fact I notice again this large blue color crossing the black screen horizontally (same as picture above), first when I started the initialization of the device then all times when I open the Application Navigation,

May I ask you please to perform the test (launching the Navigation app) and let me know if you notice the same.

Can we consider that as a defect and a cause for returning the device.

Thanks
[Galaxy Tab 7.7 General] ThE_SoUrCe:
:) I'm seeing that the picture above is a SCREEN CAPTURE; hardware defect won't be captured there so rest assured. the blue haze you see is a background image of that App you're using. It's like a design to make things more eye pleasing rather than a pure black app background

I want to try it as well but I'm running on ICS, yours seems to be running on HC (gray taskbar)

-source
[Galaxy Tab 7.7 General] sos_sifou:
hahahhaha is this a joke? of course it is a background!

best regards

Sifou

Galaxy Tab 7.7
[Galaxy Tab 7.7 General] ThE_SoUrCe:
I believe you should've qouted samaliset - we're practically saying the same thing :)

Regards,

-source
[Galaxy Tab 7.7 General] sos_sifou:
sorry my friend, it was a mistake :)

best regards

Sifou

Galaxy Tab 7.7
[Galaxy Tab 7.7 General] samaliset:
Little update:

Very happy to notice that hazey color diappeared after I upgraded to ICS (HG) version.
[Galaxy Tab 7.7 General] hot0m:
I have those dark circles/rings when I dim the screen brightness. Do you think squaretrade will replace or fix it?
[Galaxy Tab 7.7 General] biopsin:
I can only say that after moving to cm9/cm10, the black rings are gone...Something weird with the HC drivers or my tab is now 1year old and the glue or what ever keeps the screen together has waporized..

I added some test images
[Galaxy Tab 7.7 General] hot0m:
Thanks for the test images. I will test my SCH-I815 screen. Does that mean that the black rings are software related on your Samsung GT-P6800 (HK)? Is your screen digitizer separating from the amoled panel as the adhesive vaporized?
[Galaxy Tab 7.7 General] hot0m:
I used those test images biospin provided with the brightness turned at its lowest setting and found if I got within five inches with reading glasses I can see slight shadows in the darkest and brightest areas. If this gets worse I may have to see if squaretrade will repair it. The attached more test patterns that may prove useful.
[Galaxy Tab 7.7 General] Morloc2:
what did you do to move this circles?
[Galaxy Tab 7.7 General] dfkt_:
I tried pretty much every ROM out there - stock, Noob, CM9/10/10.1, PA2.5/3.0 - the circles stayed the same, no difference at all. Pretty sure people are either imagining things when they say the circles went away or became less visible... or maybe for some people's devices it is as Biopsin said, that something mechanical/chemical changed in the screen material. Another thing might be that various ROMs use different values for minimum brightness, so the circles are perceived differently in contrast to the rest of the screen.
[Galaxy Tab 7.7 General] EarlZ:
Internet articles also point out that OLED is 'off' when displaying black (#000000) but in reality its still remains lit. This is not a very big concern for me on the Tab7.7 as long as the entire screen has a uniform lit and retains the black levels that the SAMOLED Plus has and not the HD SAMOLED blacks.
[Galaxy Tab 7.7 General] mailings:
Isn't it sad that instead of choosing which one is the best tablet for me we have tho choose which one is "not that bad" ?
[Galaxy Tab 7.7 General] EarlZ:
I am exactly on that boat right now, I initially wanted to get an Asus Transformer prime but not only that I would deal with possible screen issues but rebooting, touch panel issues, BT,Wifi,GPS and a host of other things.
[Galaxy Tab 7.7 General] SonicTab:
Here's a link to a few test images...

http://members.shaw.ca/JVphoto/TestImages/1280x720/

If can you look at them on a LCD monitor vs a AMOLED screen

be interesting to hear or see the differences...
[Galaxy Tab 7.7 General] EarlZ:
The darker spot may not matter that much now but the black and white mode on the ics browser might make it more obvious and this is something ome must accept as a 'limitation' on the screen.
[Galaxy Tab 7.7 General] EarlZ:
Thanks for those, it should help anyone wanting to do more tests.. for me i just put the keyboard in portrait/landscape and check for color uniformity and the open a website and check for white levels including deadpixels.
[Galaxy Tab 7.7 General] GOF007:
Yeah I may be lucky.

I noticed something, either it was by intention or the image is in bad quality.

There are some uneven color(squared patterns) on every gray images (except jedi one). And I mean on the image not my screen. (I tried moving the image around and those patterns moved according to the image movement).

Edit: some uneven black/white on black image but very difficult to see even in completely dark room(tried to get my eyes used to darkness for a while).
[Galaxy Tab 7.7 General] EarlZ:
There should be no bad images there as they are all made with 1 solid color and saved with png. Try to check with a color picker.

Try saving the images instead of viewing them with the web browser.