yashsingh1/xdaforums huggingface dataset:
[Galaxy S 4 Q&A, Help & Troubleshooting] hung2900:
Have you seen S4 in real life? The true ppi of Pentile is still a conflict, but it's definitely base on the number of sub pixels (if so, 1080p is the same is 720p?, so why S3 is much much sharper than S2?)

I do not think 1080p RGB LCD on <5inch phone is a significant improvement compared to 720p (nearly useless for most), but for Pentile is the big difference there. A prefer 1080p Pentile Amoled screen than 1080p RGB Amoled screen, just about of the price only is enough. Galaxy Tab 7.7 screen cost is $170, leading to the expensive price of that tablet.
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
I agree. From a normal distance I couldn't see pixels on the One X. However, I often bring my phone in to around 6 inches when I'm laying in bed reading and browsing websites. In that case I can see jaggedness and pixelation even on the One X, Nexus 4, and iPhone 5. It's not a deal breaker for me, but I would still prefer to never be able to see that. On the Droid DNA and other non-pentile 1080p phones I can never see jaggedness / pixelation, even when I bring the phone in to 6 inches away.
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
When "zoomed out" content's displayed over a larger number of pixels making it less likely to see jaggies, not more. Text on my 147 PPI Note 10.1 looks great zoomed and worse with smaller and finer content.
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
Because the S3 has 60% more subpixels than the S2 does.
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
Zoomed OUT, meaning everything is smaller, displayed over a smaller number of pixels. Ex. Zoomed out = seeing the whole webpage at once.
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
And right you are. Sorry about that I was doing two things at once. ;)
[Galaxy S 4 Q&A, Help & Troubleshooting] :
I think it's more than that --

HOX - 1280*720*3= 2764800

GS4 - 1080*1920*2= 4147200

50% more sub-pixels.
[Galaxy S 4 Q&A, Help & Troubleshooting] Zanr Zij:
Do you know that SS decrease brightness of from S3 for better battery life? I believe they will do it again with S4 althought I heard that it brighter than S3. Totally One X screen is one of the best accept black color :)

Sent from my GT-N7100
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
****. You're right. That's a more accurate way to calculate than PPI because it includes both dimensions. Let me recalculate.
[Galaxy S 4 Q&A, Help & Troubleshooting] AndreiLux:
You cannot compare it like that anymore because of the diamond sub-pixel layout. The "true" resolution would be something that's tied to the smallest grid-pattern that a display could display; in the case of the S4 that's worlds apart in how they can display that with the new display, as opposed to the layout on the S3 or Nexus. You're specifically able to use a smaller "logical" pixel geometry than used in the last generation, here the position and geometric shape of the resulting "pixel" is vastly more versatile to what was capable of the RGBG layout. Think of it how old CRT's displays rasterized pixels from their honey-comb mesh in their shadow-mask.

You can't calculate it unless you know their proprietary algorithms in mapping logical pixels to the physical sub-pixels. We're entering uncharted areas where PPI loses its meaning.
[Galaxy S 4 Q&A, Help & Troubleshooting] SilentEYE:
Does anybody know if the S4 will have the ugly white colour reproductin of the S3s Amoled screen ( it is more blue) and the same low brightness?

In my opinion the S3 has a really bad screen for reading texts and using the phone under the sunlight.

If the S4 has the same screen but with a bit more pixels at 224 candela it also will be the most overrated phone on 2013.
[Galaxy S 4 Q&A, Help & Troubleshooting] Zanr Zij:
At resolution Full HD, I don't care much more about subpixel cause that I'm still quite happy with my dual Full HD Dell Ultrasharp. White color, brightness are goal I want to see :).

I believe 7 screen profiles - Adapt display - will not solve hardware problem. Maybe better than without Adapt but not much.

I still will follow S4 real life infor. If screen is better, battery life is equal or better than Note 2, I will go S4 :D.

Sent from my GT-N7100
[Galaxy S 4 Q&A, Help & Troubleshooting] hung2900:
Not only S3 but also Note 2. The brightness is higher with auto brightness under strong light, and even higher with the increase in gamma when we turn on "Outdoor Visibility" (Camera). I think it's reasonable when nobody needs maximum brightness under indoor condition. Not only for battery life, but also the lifetime of subpixels (and maybe the battery test on GSMArena too, lol)
[Galaxy S 4 Q&A, Help & Troubleshooting] Kremata:
GALAXY S4 RAISES THE BAR WITH 440 PPI PENTILE OLED DISPLAY
[Galaxy S 4 Q&A, Help & Troubleshooting] hung2900:
Not only that, but current technology does not allow producing RGB 440 ppi OLED screen.

And I really don't understand the need of increasing ppi more (or even from 440ppi RGBG to 440 RGB). In fact 1080p impacts on performance significantly.
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
So let's do a correct comparison this time. My apologies. I calculated the subpixels per square inch for some popular phones below. It looks as though the S4 will indeed be sharper than the One X.

Galaxy S II = 480x800 * 3 subpixels per pixel = 1,152,000 subpixels / 8.16 inched squared screen size = ~141k subpixels / square inch

Galaxy S III = 720x1280 * 2 subpixels per pix = 1,843,200 subpixels / 9.85 inches squared screen size = ~187k subpixels / square inch

HTC One X = 720x1280 * 3 subpixels per pix = 2,764,800 subpixels / 9.44 inched squared screen size = ~293k subpixels / square inch

Galaxy S4 = 1080x1920 * 2 subpixels per pix = 4,147,200 subpixels / 10.68 inches squared screen size = ~388k subpixels / square inch

HTC One = 1080x1920 * 3 subpixels per pix = 6,220,800 subpixels / 9.44 inches squared screen size = ~659k subpixels / square inch

Based on that, we can calculate that the S4 screen has the same number of subpixels as an 882x1568 non-pentile screen would have.

882x1568 * 3 subpixels per pixel = 4,148,928 subpixels

A 5 inch 882x1568 non-pentile screen would have a PPI of 360.

So if the equivalent non-pentile PPI of the S4 screen is 360, then it is indeed extremely sharp. Sharper than the One X (312 PPI), iPhone (326 PPI), and even the Rezound (342).

In light of this, I take back my previous comments. Maybe you really won't be able to see the pixels on the S4, even at close range.
[Galaxy S 4 Q&A, Help & Troubleshooting] TingTingin:
Yaaaay :D

And here I was thinking u were a troll

S4 INFO
[Galaxy S 4 Q&A, Help & Troubleshooting] gtg465x:
True, we can't calculate the exact equivalence, but calculating based on the number of subpixels per square inch is still better than how I originally calculated (based on subpixels per inch in a straight line) and at least gives us a rough idea of how sharp it is.
[Galaxy S 4 Q&A, Help & Troubleshooting] :
I won't venture into how Samsung is trying to create a full pixel from this diagonally mapped sub-pixels. Looking at the sub-pixels, it's "dots" rather than rectangular sub-pixels. Similar to a PC CRT.

Have you seen this Samsung patent?

http://www.google.com/patents/US7889215

Maybe it has something to do with the 'diamond' arrangement.

---------- Post added at 12:42 AM ---------- Previous post was at 12:33 AM ----------

Can I try to make this calculation in a different way?

Taking example of GS4:

1080*1920*2= 4147200 sub-pixels.

In a RGB matrix it would be effective 4147200/3= 1382400 pixels.

We know that it's a 16:9 screen.

So, 16x * 9x = 1382400

or, x=97.98

So, equivalent pixels in both directions are

16 * 97.98 =1568

and

9 * 97.98 = 882

So, the PPI = [(1568^2 + 882^2)^1/2]/4.99 = 360 (approx)

Yay! same value :)
[Galaxy S 4 Q&A, Help & Troubleshooting] AndreiLux:
Subpixels per square inch is probably a vastly better measure than PPI, however it's still something that's not capable of describing edge resolution. Good try though..

Yes, I've seen that patent filling. However I'm not going around to claim that I understand what's going on there since it also cover a vast amount of other techniques - the one used in the S4 is probably in there too (Figure 25 & 27?).
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
This was posted only two pages back in this thread. And the reflectance and infinite contrast of AMOLED displays make them appear brighter than they really are.

---------- Post added at 12:36 PM ---------- Previous post was at 12:25 PM ----------

God how I love facts. ;) And if you believe the PhD'd author of the article I linked a couple of pages back who also owns the company all display makers buy their callibration equipment from, at 10-12" away, you couldn't tell the difference between a 360 PPI display vs. a 471 PPI display. And if you believe Anand from Anandtech, he said "you'd need a microscope to see individual pixels in the SGS4's display." And has anyone here actually seen either a One or SGS4 display to form such set opinions?
[Galaxy S 4 Q&A, Help & Troubleshooting] TingTingin:
See this is what a proper debate is like not the flame wars we've been seeing recently I am actually just sitting back and reading

S4 INFO
[Galaxy S 4 Q&A, Help & Troubleshooting] Matarese171:
If the 'true' display turned out to 360 PPI then I would still be very happy. My One X is 312 PPI and thats still sharp as hell. GS4's display is going to look amazing doesn't matter if its pentile.
[Galaxy S 4 Q&A, Help & Troubleshooting] yahyoh:
i think in the GS4 its Fig 27 :confused:

but what that mean IDK :rolleyes:
[Galaxy S 4 Q&A, Help & Troubleshooting] Kremata:
Pentile is an excellent technology, the problem is, it was never intented to use with PPI under 300. And 300ppi is a minimum. Some phone makers used the technology before it was ready with some 230ppi. at 230ppi of course it looks bad. But that is not the Pentile fault it's the phone makers fault. But now everybody is blaming pentile.

Source: http://pentileblog.com/
[Galaxy S 4 Q&A, Help & Troubleshooting] Basil3:
Can someone explain to me why Amoled is said to have a black value of 0 cd/m2 and infinite contrast? How does this tie in with the most annoying feature of Amoled, black crush? If you are viewing a black screen on Amoled and there are sections that are even darker, then how can it be a true black?

I'm sure someone can explain this to me.
[Galaxy S 4 Q&A, Help & Troubleshooting] Closed Source Project:
I have no clue what you are talking about. On my AMOLED Nexus One and SuperAMOLED on my HTC One S all blacks are exactly the same and smooth. Blacks are the best on AMOLEDs.
[Galaxy S 4 Q&A, Help & Troubleshooting] Kremata:
If the blacks are not the same, there must be something wrong with your screen because the black on Amoled is pixel off. So how can the black be differents when the pixels are OFF.
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
It's not solid black that's the issue. It's gradients that start to move from black to gray. And it's tied to the graphics drivers stepping what's displayed in larger blocks than they should be and that the device and OS should be capable of displaying. It's also not unique to black but it's more visible.
[Galaxy S 4 Q&A, Help & Troubleshooting] Kremata:
Well we must have a different Amoled, mine is pure black no gradient at all.
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
I didn't say it well. ;) I meant in something like this where it's supposed to gradiate from black to grey. In this picture the transition is smooth.

Black crush makes the transition blocky.
[Galaxy S 4 Q&A, Help & Troubleshooting] Basil3:
Maybe I'm using the wrong terminology. Put a black image on your screen. I guarantee you will have small dots/splodges that look like ink blots on the screen. My Note 2 has it, my SGS3 had it, my girlfriends SGS3 has it.

If you haven't noticed it before then maybe it's best to not look for it. Once you know where they are on your screen, you can tune in to them, especially when watching a movie.

My point is that a plain black AMOLED screen isn't uniformally plain black. Some parts are darker than others.
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
Here's an (extreme) example from a Motorola phone that someone took with special lighting. My N2 may have what you're describing to some degree but I've never bothered to check it in a dark room and under the conditions you have to set up. It's not something even people complaining about it can see in typical use. But there's lot of funkiness that happens with AMOLED that doesn't with LCD including swings in color temperature from device-to-device.

But then with AMOLED you'll never have to worry about LCD bleeding either.
[Galaxy S 4 Q&A, Help & Troubleshooting] AndreiLux:
That image is supposed to be blocky... http://i.imgur.com/Ui6eJXN.png

They fixed the light bleed on the new panel:
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
Q

There are separate conversations going on - black not being consistent in AMOLED and "what's black crush?' My answer to "what's black crush?" is accurate even if the pic I randomly grabbed off Google doesn't represent it well. Here's a video showing it. And no one knows if it'll affect the SGS4 or not. Blacks are consistently black in AMOLED. Either during manufacturing or assembly from contact, under the right conditions, you can see random "blobs" on the display. There are discussions of both these things in every Samsung device forum. And I didn't offer an opinion on either.

[YOUTUBE]0a8aIGeLERg[/YOUTUBE]

Who are

they

? The pics I posted (which were just examples) are a N10 which uses a Samsung-built display and a N4 which uses a LG-built display. You posted a pic of a XZ which uses a Renasis (Sharp) display. LCD displays can suffer from light bleed to some degree because of the backlight used to illuminate them. I have no clue which brands are better or worse. Same thing for each of their individually offered displays. Again, just stating a fact.
[Galaxy S 4 Q&A, Help & Troubleshooting] AndreiLux:
Considering I fixed the black crush on the devices, I don't think you need to explain me what black crush is.

I'm just stating that you're incorrectly claiming that that image is supposed to be smooth in its gradient; it shouldn't. The gamma steps should be visible.

Sorry but what the ****? What does this have to do with anything?

We're talking about Samsung's AMOLED displays here, I don't know what your issue is with suddenly bringing up the LCD manufacturers or even the Z, the comparison is about the light bleed on the S3 and Note 2 which has been fixed in the S4 panel, as displayed by the picture I posted. Please crop away the Z out of the image if it makes you happy.
[Galaxy S 4 Q&A, Help & Troubleshooting] thachosenone:
How come my gnex doesn't have what that s3 has when I have a completely black screen? Don't get me wrong, on max brightness, you can see the screen is on, but what's with those splotches?
[Galaxy S 4 Q&A, Help & Troubleshooting] BarryH_GEG:
So criticizing me grabbing a bad pic was more important than answering someone else's original question? I was trying to be helpful based on what I know and used a bad example. You know far more than I do and it had to be coaxed out. Which is worse?

People were criticizing AMOLED and I brought up that LCD isn't perfect and used screen bleed as an example. Your pic was answering a different question.
[Galaxy S 4 Q&A, Help & Troubleshooting] AndreiLux:
What the hell is your issue? You didn't grab a bad pic, the picture is perfectly fine. I just corrected your description of what it should show.

I answered Basil3's question in the same post, so again, what's your problem? Please re-read his post. He described exactly what can be seen in the Chinese picture I posted, and I stated that it's fixed on the S4. I wasn't even replying to you in that regard so don't know what made you feel that I was addressing LCDs. You are the only person who brought up LCDs.

I think you're confused on what the issue at hand even is; the S3 and Note 2 don't have absolute blacks, it's still a light bleed.

Please brush up on the reading comprehension...
[Galaxy S 4 Q&A, Help & Troubleshooting] Livebyte:
You are wrong.

Cause now the menus are in WHITE.

And it's not PHOLED, its AMOLED.
[Galaxy S 4 Q&A, Help & Troubleshooting] Crisisx1:
I think you guys are complaining and looking way too much into it... Acting like your gonna be looking thru a telescope or magnifying glass every time you look at your phone lol. Sheesh
[Galaxy S 4 Q&A, Help & Troubleshooting] Basil3:
Sorry guys, I took everything way off topic, and to be honest I'm still none the wiser as to how these 'ink blobs' exist on an AMOLED screen (how can something be blacker than pure black?).
[Galaxy S 4 Q&A, Help & Troubleshooting] astoncheah:
BarryH_GEG,

You misunderstood what Andrei said, he was simply replying that the black spots (or whatever it calls) the AMOLED "typical" character had, has been taken care in S4 based of the Chinese picture showed. I can understand though :)
[Galaxy S 4 Q&A, Help & Troubleshooting] expertzero1:
awesome if they fixed the light bleed on the s4, I'm happy. was really annoying to see all those dark spots on the note 2 and s3.
[Galaxy S 4 Q&A, Help & Troubleshooting] ziphnor:
Well i dont have a LCD TV, but i do care somewhat. I have a 60" Pioneer Kuro Plasma TV running in Pure mode, while i didnt want to pay for it to get a prof. calibration, running in pure mode it is still more accurate than other TV's after calibration.

To my eyes, the S3 screen is pretty horrible. I dont mind exaggerated colors on a phone ( i really do on a TV though ), but the sickening discolored whites i could not live with. Interestingly my trusty old HTC Desire which also uses AMOLED looks better in this particular regard. The best screen i have seen so far is the one on the HTC One X.

I will be waiting for a few reviews on the S4, and if they have improved the colors i will probably buy it.
[Galaxy S 4 Q&A, Help & Troubleshooting] kromosto:
lol as we all know super amoled has light leak in black (if you didn't know you can try or watch the video about this published by xda) so saying s3 contrast is infinite is wrong and because of this, this graph is a joke.

and if s4 is similar to s3 or note1 (rgbg) then for sure i will not get it even if it have 1000ppi.
[Galaxy S 4 Q&A, Help & Troubleshooting] Basil3:
That's the point I was trying to make earlier, thanks!
[Galaxy S 4 Q&A, Help & Troubleshooting] yahyoh:
i don't have any ink blobs on my note 2 display and the black on the note2 better than GS3 and GS2 but it has little light bleeding ( like 1% or 2% ) :p

but on my S2 i have :rolleyes:
[Galaxy S 4 Q&A, Help & Troubleshooting] kromosto:
note2 's screen is very very good. yes has some leak but i am ok if s4 has exactly the same screen with note 2 at 1080p resolution.
[Galaxy S 4 Q&A, Help & Troubleshooting] gabrielpina4:
BACK TO THE MAIN TOPIC AT HAND! There not going to use the new phosphorus based ambled screen tech... there using a super hd 1080p samoled screen I think your all.confused ... They are are two completely different screens entirely and they already said which one they picked and will use and its not I repeat not the new phosphorus ambled one .. Which I'm guessing might be used for the gs5 in the future. or the note3 either way the phosphorus ambled screen will be the next gen screen after 1080p since the phosphorus ambled can produce 4k which I'm guessing is where they are headed after 1080p.
[Galaxy S 4 Q&A, Help & Troubleshooting] TingTingin:
U said ambled 4 times in that post

Check your keyboard

Also there isn't a phosphorous based amoled screen there's a phosphorous based OLED screen it's called PHOLED :p

S4 INFO
[Galaxy S 4 Q&A, Help & Troubleshooting] gabrielpina4:
Yes I know that's what I'm trying to say that gs4 isn't gonna use the brand new pholed tech ... Its still using the old amoled screen pushed to 1080p and that's it..
[Galaxy S 4 Q&A, Help & Troubleshooting] pewpew345:
At the very least they changed the pixel arrangement for the better and eliminated some problems, better than nothing I guess.
[Galaxy S 4 Q&A, Help & Troubleshooting] Nokia1234:
Matrix layout is better, but can not be longer than 440ppi PenTile is a disadvantage either.
[Galaxy S 4 Q&A, Help & Troubleshooting] Kremata:
Pentile at 440ppi on Amoled is fabulous.
[Galaxy S 4 Q&A, Help & Troubleshooting] newbieandroid:
No it's not the Galaxy Note 2 has a RGB subpixel layout at 720 x 1280 AMOLED display. One of the only RGB AMOLED displays I've seen in a consumer phone. While the Galaxy S 4 has a Diamond matrix. That is why I got it :) I would like to see a comparison between the Note 2 and the Galaxy S 4

If you look at the pixel layout of the Note 2 they made the Blue pixels larger so that they will last longer and Burn in will take a longer time to appear.
[Galaxy S 4 Q&A, Help & Troubleshooting] kromosto:
vaow note2 has better quality screen even with less resolution :( . my note1 is nearly death and no warranty unfortunately so i was looking for a new phone. i was between s4 one and note2. if this is the quality difference between note 2 and s4 screens then i am now between note2 and one.

NOTE: sorry read s3 like s4 :)
[Galaxy S 4 Q&A, Help & Troubleshooting] cbutters:
This is a great thread with some very interesting discussion.

Has anyone seen any up close shots of icons on the galaxy s4 similar to the ones a few posts above? I'm very excited to see how visible (or non-visible) the non-conventional subpixel layout is at this level of ppi.
[Galaxy S 4 Q&A, Help & Troubleshooting] Baldilocks:
I pretty much think it's a non-issue with this phone. The pentile layout of the GS4 is quite different than the GS3 or even the Note II.

No close ups of Icons yet, but even from this pic, you can see that the screen is very sharp and very crisp..
[Galaxy S 4 Q&A, Help & Troubleshooting] cbutters:
Great find on that image,

Taking your lead, I grabbed the other photograph of the screen:

I am noticing a slight pattern in the clouds there that looks like the diamond "pentile" pattern... Not nearly as noticable as the GS3's pentile arrangement, but still noticeable (at least in this photograph... and assuming I am seeing what I think I am seeing.) I feel like this arrangement is much less noticable than the checkerboard pattern of the GS3, and at this PPI, I think it most likely wont bother me if indeed it is as visible as this picture seems to make it.
[Galaxy S 4 Q&A, Help & Troubleshooting] Baldilocks:
If you notice, there is some jaggedness of the edges of the phone itself, so not sure if it's the screen or if it's just the way the picture was enlarged...
[Galaxy S 4 Q&A, Help & Troubleshooting] -]Megacharge[-:
It does only on white backgrounds.. it can use up to 5 times more power than LCD. However, on black backgrounds, it will perform better in battery life as the pixels are actually completely turned off. The new PHOLED display in the S4 should help out a bit with the high power consumption on white screens, but it will still most likely use more power than LCD on white backgrounds.
[Galaxy S 4 Q&A, Help & Troubleshooting] GTRagnarok:
The S4 doesn't use PHOLED. Maybe we'll see it in the Note 3.
[Galaxy S 4 Q&A, Help & Troubleshooting] cbutters:
Ok, found some up close screenshots of icons on the GS4 from this a video preview on youtube by TheAngelofMusic1989

Looks pretty good considering... I'm surprised how well the note 2 screen holds up, but the resolution that we are seeing on the GS4 is quite good.. The diagonal pattern is still visible (at the up close level) I'm thinking I could probably still see it in person, but only if I was trying very very hard. I'm getting more confident that the pentile screen won't be an issue for me like it was when I had the GS3.