yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab 7.7 General] GOF007:
I get 55 55 55

except some part(top part) 54 54 54 in the Grey-55.jpg (Photoshop)

65 65 65 and 64 64 64 in Grey-65.jpg

Edit: I saved them.
[Galaxy Tab 7.7 General] DaveC1964:
Well every OLED screen displaying black I have seen has some glow in a dark room with your eyes adjusted to the dark.

My first device with OLED was a Zune HD. Even that screen as small as it was has the faint glow in a dark room, and it had the black blotch patterns as well. At the time I was dissapointed, I remember thinking OLED is supposed to do true black! I guess it is probably due to the fact that the TFTs that control the pixels do have some current leak to a point. The blotches are likely due to the process and the glass isn't 100% clean to the molecular level. Any residue on the panel causes a slight bit of resistance, enough to effect the glow. When the brightness gets to a certain point all TFTs will get past their thresholds and fire causing the blotches to fade away.
[Galaxy Tab 7.7 General] mailings:
As EarlZ already said, that glow would be aceptable if where even across the screen

I have attached a picture of how my screen looked like.
[Galaxy Tab 7.7 General] f1ux:
I can't see any issue with that image.

My 7.7 hasnt arrived yet, hopefully tomorrow or saturday but with my sgs2, in a dark environment with black on the screen you can't see anything other than black.

By this i mean, I can't see any colour difference between the black bezel and the black on the screen.

If you CAN see a difference and are complaining about it, to be honest you must in complete total darkness and staring at a screen in those conditions is not good for your eyes.
[Galaxy Tab 7.7 General] mailings:
Ok, Let's try it again...

I have marked the more visible circles but, there are more behind the white text.
[Galaxy Tab 7.7 General] randomgent:
Mmm the circles pattern on your tablet is exactly the same as mine, 6 medium circles and two small circles,do you reckon the circles are part of the capacitive sensor?.
[Galaxy Tab 7.7 General] mailings:
I also have a Galaxy Nexus, it's suposed to have a capacitive SuperAmoled screen and there aren't any circles, so I don't think that are part of the sensor.
[Galaxy Tab 7.7 General] f1ux:
It would probably be useful to state your purchase date so newer buyers can compare build quality.
[Galaxy Tab 7.7 General] EarlZ:
Whoooah! Those circles are horrible and not even remotely close to acceptable... I wonder if a good majority of the screens are like that?!

Also do you have a Galaxy S or S2 to compare with, is the black level similar to the S/S2 or is it more like the note, extremely lit like a an LCD?
[Galaxy Tab 7.7 General] eallan:
Just had to chime in and say that this is wrong.

12 subpixels per pixel??

1280*800*12 = 12,288,000 Subpixels???

The ipad has only 2,359,296 Subpixels. So the 7.7 has six times as many subpixels in a smaller (by 2 diagonal inches) display?

The real answer is the note has 2 subpixels per pixel, whereas the Plus displays have 3 subpixels.
[Galaxy Tab 7.7 General] EarlZ:
This might be the source of confusion?
[Galaxy Tab 7.7 General] mailings:
I bought my tablet on february 3, 2012

I have been sent a new one. I'll test the new one and post my findings.
[Galaxy Tab 7.7 General] EarlZ:
Please do.
[Galaxy Tab 7.7 General] eallan:
Could be, that's 4 pixels. What a weird piece of marketing.
[Galaxy Tab 7.7 General] reiconol:
It seems that most if not all have these suction cup ring marks, if that's what they are. However I think Mailings has changed the contrast/saturation of his original image to make the rings really stand out (if not I apologise, and he really has a bad screen). Yes they are very slightly visible in a totally dark room with a black image showing on the screen. In reality they are not as noticeable as in his second image, and more like his first.

I want to point this out to prospective buyers because it really isn't as bad as it looks in his second image. Yes they are there and some people may be sensitive to this and so can see them more easily. I understand this may put people off, but normally, they are not visible. Mailings has had to adjust the image to make it visible.

If one of your use cases is to use the device in total darkness and viewing a mainly black static screen for long periods e.g. an ebook in a black background and white text configuration, the 7.7 is probably not for you. Otherwise, the 7.7 is truly a great device. I've had an iPad1/2, Acer Iconia, Asus Transformer, Tab 10.1, and this is the best tablet I've used yet.
[Galaxy Tab 7.7 General] EarlZ:
Im only looking at the first image for reference, of course the visibility of these rings vary from device to device. Would you be able to post samples of yours?
[Galaxy Tab 7.7 General] GOF007:
This is my screen taken in dark room at ISO800. Red border indicate screen area (roughly).
[Galaxy Tab 7.7 General] reiconol:
I have just compared my S2 with the 7.7. In a dark room (its 01:15am here) and brightness set at manual and maximum. The 7. 7 is no way like a normal backlit LCD. If anything my S2 is slightly brighter than my 7.7 and the S2 has a redish hue. The S2 colour is more uniform whereas the 7.7 is more blotchy. If comparing screen quality in this environment setting (dark, and dark) I would have to say my S2 panel is better quality than my 7.7 panel.

I could post my devices side by side, but to make the image fair I would need to setup my DSLR and tripod and take a steady long exposure shot, which is not really the time for me to do now.
[Galaxy Tab 7.7 General] GOF007:
Another picture

Tripod ISO200 F3.7.
[Galaxy Tab 7.7 General] reiconol:
I'd like to add that I used a black colour image saved as png for the above test. And also they both displayed black with the S2 slightly redish, and they don't exhibit a glow like a traditional backlit LCD panel.
[Galaxy Tab 7.7 General] EarlZ:
Would be better if you used a higher exposure time, say 10seconds?

No need to post the devices side by side as I've already seen how the black levels are on the S2, its pretty deep compared to the note which I consider significantly more lit.

Just a picture on the Tab7.7 would be nice, so it can bring some balance to this issue as currently Im concerned if all the tabs have these rings. Its pretty rare for me to use it as an ebook reader but I hope it wont be noticeable in my movie viewing.

The other thing that bothers my a tiny bit is the excessive sharpening the mDINE engine adds which is also on the Tab 8.9 , Tab 10.1 and 7.0 Plus.. Samsung should have made this option as an enable/disable feature.
[Galaxy Tab 7.7 General] GOF007:
I dont have DSLR at the moment :P
[Galaxy Tab 7.7 General] EarlZ:
There should be a manual setting in most basic camera's my very sold Sony that was bought more than 7yrs ago ( i think ) has upto 30seconds of it.
[Galaxy Tab 7.7 General] GOF007:
Ok this one is 15sec

Took me a while to figure how to do that lol.
[Galaxy Tab 7.7 General] f1ux:
Your photo also seems to exhibit the random circles if you jack up the exposure/contrast. I can even see your camera now :)

Here it is attached with contrast enhanced.
[Galaxy Tab 7.7 General] GOF007:
I can see those circle (and my camera) in the original picture too.

As I mentioned before, they are very difficult to see on screen with my eyes adjusted to the darkness in completely dark room.

(The circle only visible to eyes when the screen is completely black, if there are some text, those circle cannot be seen at all.)

And those circle seem non-random, they are at exact same place as in pictures post by mailings.

Edit: I cant live if my screen look like the first image :P

1. mailings's image

2. my image (contrast adjusted)

3. my image original
[Galaxy Tab 7.7 General] f1ux:
I'm surprised you can see the circles/camera in your original image before my 'tweak'

I can't on my MBP with calibrated screen at full brightness,my ipad2, my plasma tv nor on my SGS2. i think maybe your computer screen has the brightness turned up too high :)
[Galaxy Tab 7.7 General] GOF007:
Brightness on my screen is at "0" (the lowest it can be) lol.

The monitor is LG Flatron D2342 3D.

The angle you look at your screen effect the picture if you looking from too low angle you probably cannot see those circles.

I look at my monitor like ~80 degree from the top.
[Galaxy Tab 7.7 General] EarlZ:
I can easily see the circles on his pictures but if its not that visible in normal usage with something on the screen then its fine with me.
[Galaxy Tab 7.7 General] aaronv20:
Screen issues as well

I am returning/exchanging My tab as well. I really dont want to but the streaking of grey and white annoy the hell out of me. Its only noticed when the screen is turned down to 0,(setting i use to read in bed) but for its price I'd expect it not to have this issue. Anyone else seeing this same "streaking"

I didn't realize the photo would upload horizontal, but the streak is at the bottom across entire screen , kinda faint in this photo but very noticeable in person!
[Galaxy Tab 7.7 General] EarlZ:
I do see a very huge shadow line on the bottom and some green and reddish on the edges, are those visible as well or caused by the camera?
[Galaxy Tab 7.7 General] aaronv20:
I believe those are from my camera. I glad you see it too...I thought i was seeing things...oh well , Negri says exchange will take about 2 weeks, sucks but at least they'll take it back
[Galaxy Tab 7.7 General] randomgent:
My screen also has greenish streak on the bottom of the tablet, not sure whether its my camera,im using a dslr.
[Galaxy Tab 7.7 General] EarlZ:
Glad to hear they will replace it, those streak lines are quite common on the Galaxy Note and Nexus.. Im not sure on the S2 as I've had 7 replacements and seen several others but dont have any of those lines. Im wondering why OLED has a very poor rendering in greys/browns.

Are those 2 streak lines visible with your usage?

If you dont see it in real life, it could be the camera.
[Galaxy Tab 7.7 General] randomgent:
I sent my tab last week for replacement , cant actually remember seeing green streak on the screen, you right probably my camera. I actually wonder if Samsung will warrant this issue as a defect.
[Galaxy Tab 7.7 General] DaveC1964:
I guess I got a "good" one, I can only see the larger circles on mine.

---------- Post added at 04:44 AM ---------- Previous post was at 04:36 AM ----------

I can't really see it there. Mine has a worse streak down the center, your actually looks pretty good. I would have took yours and sent mine back!

I would exchange it but it only shows on the darkest screen at low brightness. I also have a bit of uneven brightness where the right side in portrait is a bit brighter. I really don't feel like playing the screen lottery right now. I could get one that is worse and or/ get one with bad pixels.

I have an old iPad and I turned it on recently, the screen on that is pretty terrible. It is brighter on both edges, it is yellowish on the lower quarter of the screen and the backlight glow is so bad on even a lower brightness. The 7.7 even with all of the screen flaws is still much better.
[Galaxy Tab 7.7 General] EarlZ:
The streaks are visible if you view his picture off a distance, same with my note If I use it closer to my face I cant see the 2 streaks but If i start to view it at an arms length its visible on animated films and websites.

The screen lottery part is annoying, even now Im still about to purchase Im already doing the screen lottery.
[Galaxy Tab 7.7 General] mailings:
You won't see the circles using the tablet during the day. And at nights, you will see the circles when on a really dark screen or if use an app like screenfilter to lower the brightness.

I'm also thinking about keeping the new tablet if the screen is just slightly better.
[Galaxy Tab 7.7 General] EarlZ:
I dont intend to use the screen filter app, so with the text you have displayed is it still visible in a totally darkroom?
[Galaxy Tab 7.7 General] randomgent:
Yea same, im unable to see the circles in daylight or bright room, this makes me harder to show the screen defects at the sales guy.

The screen is pretty bright at low brightness in the dark, it might annoy you.
[Galaxy Tab 7.7 General] mailings:
You won't se the circles if they are behind the text, but you will see them in the part of the screen not covered by text.

As randomgent said, event at it's minimum brightness, in a dark room the screen is too bright.

I use FBReader as ebook reader and Colordict as dictionary and without scrennfilter when I have to check the meaning of a word I get glared.
[Galaxy Tab 7.7 General] guopengzhu:
Got mine from ebay and fedex from HK. 3g version. Box opened but as told to do checking and put power adapter, the AC charger comes UK type. Looks new and unused. Used pure colors to check dead pixels and circles, no circles but at least 3 tiny dead pixels. No I tension to exchange as won't notice in normal use. If ten yrs ago, I won't sleep till its exchanged as I was a perfectionlist but not now. Life experience tells me nothing is perfect if too picky you will end exhausted and unhappy all the time as life is not perfect so does technolegy. I do understand some of you feel about the screen as I was the same before. If its not so bad just let it go as some defects can be observed at certain extreme conditions.
[Galaxy Tab 7.7 General] earthman5678:
Actually I'm not so much concern about the circle but the yellowish patch at the lower part of the screen. Really annoying because anything grey is tinted with yellow.
[Galaxy Tab 7.7 General] EarlZ:
Have it replaced ?
[Galaxy Tab 7.7 General] paulikxp:
Sorry? As the OLED screens are made of tiny LEDs and don't have background light, black means off. And it definitely is off.
[Galaxy Tab 7.7 General] paulikxp:
I seem to be very lucky to uave a really flawless screen. No burn-in after more than 4 weeks, no dark circles, bubbles, stripes or dead pixels. It's just perfect.

That the HK versions come with a UK charger is no wonder as HK used to belong to the British Empire, thus they're using the same plugs/sockets.
[Galaxy Tab 7.7 General] f1ux:
Mine has just turned up!

I dont have any of the issues mentioned in this thread and believe me i have been looking!

In fact id say its better than my gs2 screen, though when both screens are off, the s2 looks blacker under indoor lights.

Very pleased! Way better than the 7+ which i will now be selling!
[Galaxy Tab 7.7 General] reiconol:
Congratulations! Hope you will enjoy using it because it is very good :D
[Galaxy Tab 7.7 General] EarlZ:
And why do we see a faint glow then the screen is displaying a black color as compared to the screen being locked?
[Galaxy Tab 7.7 General] EarlZ:
Congrats to the both of you :)

Quality control is still random though, the last 6 Tab 7.7's I've seen have issues so far that are very visible even on store lighting conditions. Probably later batches might have better yields.
[Galaxy Tab 7.7 General] joseph168:
Dear all,

I just got my new tab after the old one had burned in, and become yellowish on the status bar. I had sold it and get a new one. My question is, is there anyways to avoid that issue after using two weeks? How to protect it? Thnank guys for your kind helping
[Galaxy Tab 7.7 General] randomgent:
Lower the screen brightness,use screen filter app , 1 min screen timeout or lower. Tend to avoid wallpaper that have lot of blue colour in it.
[Galaxy Tab 7.7 General] EarlZ:
Its all about luck of the draw when it comes to SAMOLED, some use 100% brightness at all times and never suffer any screen burn-in with in a year of usage while others already get a mark after days.
[Galaxy Tab 7.7 General] mailings:
My replacement tablet arrived yesterday and it have exactly the same circles.

So I now have to decide if keep it with that "defect" on the screen or return it and get another brand/model.
[Galaxy Tab 7.7 General] EarlZ:
On the same spot?

EDIT:

Id be interested if someone else who cares about these circles but dont have them on their screen post up a picture using 20s shutter speed, just to rule out that not all of the screens have this issue.
[Galaxy Tab 7.7 General] earthman5678:
Just sent it back today. Still subject to the technician diagnosis result before they will say yes to replace. And it is not going to be a unit replacement but only the screen. They are going to tear my tab apart and replace the amoled. I told them I want mine return without any physical damage. They said I'll loss my screen protector... Okay I can live with that but never the less disappointed. The original galaxy s and tab build quality were so much better.
[Galaxy Tab 7.7 General] mailings:
Yes, same pattern
[Galaxy Tab 7.7 General] f1ux:
I most definitely do not have the circles.

A 20 second exposure is not exactly a realistic test as your eyes will not see the same as that.

Even if you did that 'test' you need to make sure everyone uses the same image and same brightness in the same ambient light
[Galaxy Tab 7.7 General] secreetadm:
Use this picture attached for testing a cup rings issue. Zoom in, minimum brightness level for max test.

My tab got it. Poor me :(

What should i do? Is a hardware or software trouble?
[Galaxy Tab 7.7 General] earthman5678:
Those who work in electronic engineering know that the first hardware version is most likely to be buggy. Just like the Galaxy S where it had GPS antenna issue in first version but fixed in second version. iPhone4 antenna gate is the same. They tried to avoid recall that will cost them allot and quietly fix all those problem in an engineering revision that layman will not notice.
[Galaxy Tab 7.7 General] joseph168:
I don't think I am lucky enough, just using it 2 days now my screen getting burn on the status bar. So sad
[Galaxy Tab 7.7 General] EarlZ:
Well good for you that you dont see any on your screen, a 20s exposure may be realistic or not but I just want an objective result for anyone wanting to contribute. My Galaxy S2 had visible splotches which was seen with the naked eye but my camera is only able to capture it at 20s exposure, anyone with a better camera can probably just set 5seconds, the objective here is just to capture the screen glow which in turn also captures the circles if there are any screens w/o them.

Here is a reference test image, brightness does not matter but for the sake of uniformity set it at lowest possible take the picture in a totally dark room. Of course for anyone willing to contribute.

Image is #000000 created with GIMP2 and saved under PNG format.

I got this from my local samsung tech support

TBH, this circles are at the bottom of my concerns but its better to have a good screen when buying that to have the endless lottery replacement cycles. I really dont intend to use this as an ebook reader so I might let this slide if ever I get one like the picture posted a few pages back.
[Galaxy Tab 7.7 General] randomgent:
Thats really sad to hear, i also sent my tablet for replacement/repair. Does the replacement tablet came in its original sealed box?

Edit: Here some of the images of the circles and screen burn in before i sent my tablet for repair/replacement.

Red square hightlights= circle mark, pink highlight= screen burn in

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3475.jpg

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3479.jpg

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3483.jpg - Its an app that check pixels for defect, cant remember the name for the app, you can notice the circles at the dark side of the gradient but it disappears as the brightness increases.

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3633.jpg - Screen burn in on the notification bar , you can even see the remains of the softkey buttons.

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3636.jpg

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3643.jpg

- Correctly exposed, this image was taken when the tablet is shutting off, after the samsung logo animation finish, the tablet will "glow" showing the imperfections.

http://i1251.photobucket.com/albums/hh546/randomgent/IMG_3644-1.jpg - Overexposed to show the imperfections of the screen, totally look like a mold infestation
[Galaxy Tab 7.7 General] tboy2000:
wow that is terrible. I am ready to buy this tab but now I am not so sure.
[Galaxy Tab 7.7 General] joseph168:
Same as mine. But that's not really bothering me though. I love this tab. What I have concerned is the screen burn in :-(
[Galaxy Tab 7.7 General] EarlZ:
And I thought the suction cup rings that can be seen only in the dark are terrible but those images you posted above are beyond a horrid! I dont think anyone can classify those as ' acceptable '

Maybe they just returned the very same unit?

Can you attach a copy of the test images you used, thanks!

For real? Your not bothered by the visible cirlces at even the test color pattern that is 100% visible ? I envy your standards, no offense.
[Galaxy Tab 7.7 General] Coolman4now:
:(

OMG, this is truly unacceptable, I thought you were exaggerating !

Where did you get your unit ??
[Galaxy Tab 7.7 General] EarlZ:
Not pointing any fingers out but its an entirely different story when we post pictures of our issues, some will say we are just nitpicking but when they see the issue they also find it unacceptable as well.. Its always been like that with all of the screen issues I have.

EDIT:

Im wondering if there is a certain color shade that we can use to test the tablet out before buying that will not require a dark room test for us to check if there are suction cup marks.
[Galaxy Tab 7.7 General] Coolman4now:
Sometimes you have to live with the minor issues but if its that obvious its unacceptable.

I bought a Xperia Mini two months ago, it has a scrolling issue in which the digitizer doesn't seem to catchup on the middle of a swype across the screen. It was a nightmare when you scroll over on a big list like the contacts. I took it back and no one could find it an issue !! replaced it with a new one and the new one came with the same stupid issue. last week I finally snapped and replaced it with Xperia Arc S, I couldn't take it anymore. No one of my family or my friends found it an issue, but It was killing me.

Long story short, I know what you're feeling. Everybody thinks you're a lunatic, you just know the issue.
[Galaxy Tab 7.7 General] palle04:
oh **** :( i couldn't stand this for a minute. Sorry to hear that and i hope you will get a decent replacement without this
[Galaxy Tab 7.7 General] randomgent:
haha thanks, its cool , hopefully they repair or replace the screen.

Oh nah , i showed it to a friend of mine in a lecture room where it was quite dark , he totally can see it, im still sane xD.

Try to shut down the tablet , you can easily see the imperfections when its 'glowing' but it has to be in a dark room. Grey screen is the best way to check the circles but yet again it has to be in a dark room. Oh im not a picky person, when i first bought it ,i didnt check for any screen issues or defects but after 3 weeks of use i can noticed the screen burn in, circle marks and such.

JB Hifi in Australia,i bought it in january, when it first came out.

I used a pixel checker apps, sorry i cant remember the name of it. Yea im hoping for a replacement unit straight away when i head back to the store but they wouldnt give me a replacement unit because they cant see the circle marks under store lighting but they offer me to repair it which takes 6-8 weeks.Im kinda annoyed that they wouldnt replace it on the spot because the tablet was only 3 weeks old, but i cant blame them though. Hopefully they give me a replacement unit because im worried that a repaired unit would have scratches but then again it gonna take me 6-8 weeks to get my tablet back. I guess i ranked lowest in the screen lottery ;)

Been using my tablet on 0 brightness since day 1 and i still received screen burn-in. Im curious how bad is screen burn-in after two years of use.