yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Nexus] ro_explorer:
why blacks are not blacks and why they are non-uniform

I read and I read and I'm curious how come no one came with the explanation regarding why black is not pitch black and why the "black" is not uniform.

Let me try to bring some light :) ...

AMOLED means Active Matrix Organic Light Emitting Diode

Active matrix means there a is layer created of transistors that have the purpose to turn on and off the adiacent pixel.

The pixels in this case are printed (literally) on the transistors layer and because this screen has so tiny OLED pixels, not all these pixels are printed perfectly equal to each other.

At the end, we have a OLED film created on top of the active transistors.

Now .. about the functionality:

"D" comes from Diode ... and the diode is a semiconductor element which has a certain voltage threshold where it will start to actually work (allow current to flow and in the LED case, it will use some of that power flow to transform it into light).

If you want to get a high FPS rate out of your display, you will need to be able to turn on and off pixels very rapidly so, instead of completely cutting off the power from the respective LEDs you want to keep them excited with enough voltage to make them "almost active" ... actually, you will apply a voltage close to the threshold and if you want to generate light you will just bump a little the voltage ... and this is allowing to get a much higher refresh rate.

The issues in this point are:

A: there is no such thing as a perfect diode so we will always have current leakage => in a pitch black environment one will be able to see the leakage being transformed in light when the screen is active but displaying a black image.

B: Due to the very high density of OLEDs being printed on these screens (the highest in the world at the moment) the process variation is higher so the threshold voltage of each led or group of leds might be slightly off compared to the neighbors -> some leds will have lower leakage (if the threshold voltage is higher), therefore they will appear "black" in comparison.

And for the record, my screen pitch black is looking like some water leaked in near the edges because there is an irregular shape of completely black area. The funny thing is that the respective area shrinked in 2 months of using the phone.

I hope I made some light over this topic.

P.S.: This post here is me trying to explain a phenomenon using common words and terminology ... if I was a little (or a little more) off, please don't hesitate to correct me.
[Samsung Galaxy Nexus] EddyOS:
Who actually gives a ****? Really?

It's a phone. It's never gonna be as good as a D-SLR. Just move on
[Samsung Galaxy Nexus] ro_explorer:
I care :) ... and I saw this "non-uniformity" of "almost black" screen since the day one (in December) but I considered to be somehow normal for a cutting edge technology.
[Samsung Galaxy Nexus] matt30:
The Dinc with the oled screen (not the lcd version) does have darker blacks than my gnex.

It could be because the pixel pitch in the Gnex is smaller therefore current leakage brightens the pixels more. That's just speculation though. (Though if that were the case I'd expect the screen to show some residual light even when the screen is off.)
[Samsung Galaxy Nexus] ro_explorer:
When screen is OFF the power from the screen is being completely cut-off .. that why is called OFF :) ...

There is a difference between screen off and screen displaying a black picture.
[Samsung Galaxy Nexus] RogerPodacter:
My nexus one displays blacks much darker than my galaxy nexus as well. Install dead pixel detect from the market and test in a pitch dark room at night. The difference is very apparent.

It must be something with the higher pixel density. Or perhaps samsung slightly modified their amoled technology. I think the galaxy note has this issue as well.
[Samsung Galaxy Nexus] govindadas:
if I understand correctly, I've looked into this quite a bit and done lots of testing, there is a minimum voltage on pure black screens. My Gnex is not much darker than my Blackberry Storm --- it's a tough call when comparing them.

For those of you that think pure black on the screen is actually completely black and matches the bezel, you probably have to let your eyes adjust and sit in a really dark room. Just open a pure black uncompressed image (such as a png) in the gallery app and go in a dark room.

I've actually replaced the boot animation with uncompressed pure black PNG frames, and it was equally bright as the clock in night mode and noLED, and a pure black uncompressed video.
[Samsung Galaxy Nexus] ro_explorer:
I decided to put my old and trusty Canon 30D at work :) ...

Here is my "dirty" screen (is displaying a black png using quickpic and minimum brightness ... and belive me .. 2 months ago it was a lot dirtier than it is now):
[Samsung Galaxy Nexus] Dr. Hax:
If you notice in all my pictures, they're in the exact same place every time. What I wanna know is why does it appear yellow?

---------- Post added at 03:47 PM ---------- Previous post was at 03:31 PM ----------

f/4.5, 3.2-second shutter speed @ ISO 800 and its that dark? What the dell?
[Samsung Galaxy Nexus] mad_max911:
Galaxy S2 has also this "problem" noticable only in completly dark room... This is just a little marketing missunderstanding as pikels on this screens obviously does not "TURN OFF" compleatly when displaying black... Not problem anyway...
[Samsung Galaxy Nexus] doublea500:
I really dont see how this matters. Maybe 15 minutes at most of battery time...
[Samsung Galaxy Nexus] ro_explorer:
Old tech buddy :) ...

Anyway, maybe my display is darker than yours. Remember it was set on minimum brightness by hand ... if you took pictures while the phone was booting with those black pngs then it was definitely at max brightness (at least mine is while booting).
[Samsung Galaxy Nexus] player911:
Actually reading the past page makes sense. The blacks aren't off and they never were on older phones... but because of the higher density there are MORE barely lit "pixels" which make it appear brighter compared to a lower Res screen. Its like taking 15 flashlights compared to 100 flashlights. The group of 100 flashlights will still be brighter at 1% power then the group of 15 flashlights.

CASE CLOSED!

LTE EX Galaxy Nexus - CM9 AOKP

Asus Transformer - Revolver
[Samsung Galaxy Nexus] NIK516:
Regardless off the pixels being off you are looking through glass that is refracting light beams and eventually slightly altering the shad of the black so it may look grey.
[Samsung Galaxy Nexus] Soutaiseiriron:
There is actually is pictures of the difference between the Galaxy Nexus and the GS2. It's clearly evident that the GS2 deals with the situation better. That being said, I agree with what people have been saying. Because of the fact that there is a higher number and density of pixels the same thing is being shown with different results due to their different circumstances. Even if that wasn't the reason and the sAMOLED HD was inferior in that aspect, I don't care because watching HD anime on my Galaxy Nexus vs my Galaxy S is still a better experience. Heck, the experience with Galaxy Nexus' in better in general. The difference is so miniscule that light has to be nonexistent for it to be noticed. I just don't feel that this is something to complain about but to each their own I guess.

Edit: Actually, my Galaxy S did have deeper blacks but that was only when voodoo colour built in to the kernel.
[Samsung Galaxy Nexus] RogerPodacter:
I dont think anyone here is complaining about this but instead trying to understand the technical reason why this happens.
[Samsung Galaxy Nexus] matt30:
Says the person that has no idea what a capacitor does...

Sent via Galaxy Nexus
[Samsung Galaxy Nexus] Simer03:
The galaxy s2's had serious screen issue with blotches and lines of black when in a dark room! It was weird and annoying

sent from my Nexus Prime
[Samsung Galaxy Nexus] ro_explorer:
Would you mind elaborating a little? I'm just curious ... how come you've reached such a conclusion? Have I said something wrong?
[Samsung Galaxy Nexus] govindadas:
Is there really a different between maximum brightness and minimum brightness for displaying pure black?

I am thinking there isn't... it's just at the minimum voltage regardless of brightness setting. That may be why it begins to look more grainy at lower brightness, b/c you are just making the colors closer to the "background black".
[Samsung Galaxy Nexus] ro_explorer:
The led brightness is being controlled in current, not voltage.

There are several methods of implementing the brightness level. But to be sure all the leds are driven to the same maximum level and to avoid the unpleasant non uniformity in light, this max level should be predefined by a parameter and will most likely affect the whole matrix. When you have the max brightness enabled, the leakage of a led that is being turned off will be higher.

// sent from my green robot //
[EVO 4G Q&A, Help & Troubleshooting] the_v1s1onary:
I've seen this wallpaper in roms lately and it's been bugging me. :confused: It's a top-down view of a blue sea. It has about the same color as the one below. And there's a little bit of the cliff showing at the bottom with a small seagull to the right, I think. I think it's also on Deck's ICS rom, but I'm not sure since I went through about 5 roms today. :D

If anyone can help, that'd be great!
[EVO 4G Q&A, Help & Troubleshooting] HipKat:
Unzip those ROMS and look at the wallpapers in them until you find that one
[EVO 4G Q&A, Help & Troubleshooting] the_v1s1onary:
Well....

I flashed Deck's 1.3 Stable and voila it's the wallpaper that's being displayed :D ....except that I accidentally switched and now I can't find it anywhere. :confused: I looked through the galleries and the .zip but I still can't find it.....
[EVO 4G Q&A, Help & Troubleshooting] HipKat:
If it is the wallpaper that comes with the ROM, then it's in there, trust me. When I get home, I can look for you

Swyped From The Hippest MIUI'd phone Using XDA Premium
[EVO 4G Q&A, Help & Troubleshooting] alxrock:
Zakynthos

I checked it out on Google Goggles and that beach is an area of Zakynthos. There's a ton of variations of the same image, so I'm not particularly sure which one you might be looking for. If you do an image search for Zakynthos, I'm sure you'll find it.
[Samsung Galaxy Nexus] BABABANG:
Does anyone have this issue? If I lightly touch it, makes a loose shaking noise. I can hear the noise when I shake my phone too. It's pretty annoying.

EDIT: Turns out this is an issue some have been having, while others have not. I'm going to go get it replaced tomorrow...this phone is a day old. -.-
[T-Mobile Samsung Galaxy S II SGH-T989] Husam2011:
http://deals.t-mobile.com/zero-down?cm_mmc_o=Vzbp+mwzygt*-czyEwll*4bpCdAEEwk*4bpCdAEEwk

I'm posting this for people who want to buy a GS2 on contract.The sale ends tomorrow.
[T-Mobile Samsung Galaxy S II SGH-T989] dsd424:
Good evening guys, I just wanted to share with you all that I got a brand new White Galaxy S2 for my dad for FREE from retentions. I just called to see what they could offer my parents, and got this amazing deal. Blessings.
[T-Mobile Samsung Galaxy S II SGH-T989] Infrared28:
Did you have to do the rebate or did they waive it?
[T-Mobile Samsung Galaxy S II SGH-T989] Buck Shot:
Just bought mine yesterday . Not through there super sale though since its only for value plans. I called a stand in my mall. Got it for 260 with a 200 rebate.
[T-Mobile Samsung Galaxy S II SGH-T989] dsd424:
No, they offered it free, just like that. No rebates. Only the white one though.
[T-Mobile Samsung Galaxy S II SGH-T989] mightymike889:
Bet they changed ur rate plan n ur paying full price but they broke it up on installments n the initial down payment that ud have to pay they waived... its called value u plan no way they gave u that....I'd check it out BC from here on in ur buy fones at full cost but u get to break it up into installments
[T-Mobile Samsung Galaxy S II SGH-T989] dsd424:
No sorry, it's completely free. They credited the account $250 to cover the cost of the phone. They have a classic plan.
[T-Mobile Samsung Galaxy S II SGH-T989] G1_enthusiast:
this is how i got mine when the SG2 comes out :) of course i been with them for 8-9 years
[Samsung Galaxy Nexus] aloy99:
So, in contemplating upgrading to this phone, but here's my concern: When full-screen apps like YouTube force close, or when I want to exit and stop watching the current video, what do I do?

Is there a way to hack the buttons so that they stay on the screen at ALL times, regardless of the app running such that the on screen buttons are essentially equivalent to hardware/capacitive buttons?

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] Armuro:
Buttons r hidden when play YouTube video. When tap anywhere on the screen, all buttons reappear.

Actually, I would prefer all apps can auto hide the buttons to get full screen. Looks so much nicer...
[Samsung Galaxy Nexus] aloy99:
But what if the YouTube app hangs and the phone freezes? Is a battery pull the only way?

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] melterx12:
i think the buttons would still show up (they are not part of the youtube app)
[Samsung Galaxy Nexus] justin94:
When playing videos, it will go to full screen and 1 tap of the screen will show the buttons. Most of the time the buttons will disappear and be replaced by 3 barley lite circles.
[Samsung Galaxy Nexus] aloy99:
Oh, I see. Thanks. And what I meant was that both the app and the phone freeze. Is there a way to force reboot when the phone totally hangs? Like, using some button combination like how it is possible on my current device?

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] sassyness77:
Just thinking out loud here. But if the app force closes on you, you can pick the force close button that pops up or it will just close itself and bring you back to your home screen. So no problems there really, and also I don't see why so many people are scared to pull the battery out of their phones? Is it just because of the hassle? Otherwise I see people saying they're scared of breaking the back cover?
[Samsung Galaxy Nexus] aloy99:
Uhm, that's not what I mean. I mean the app totally hangs and the phone freezes too, not responding to touch input.

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] joshnichols189:
Battery pull.
[Samsung Galaxy Nexus] swordrune10:
even if u did have hardware buttons and the phone freezed ud still have to do a battery pull, ive witnessed it a few times when working with my droid eris..
[Samsung Galaxy Nexus] MrBig0:
Yeah, currently the only way to force a reboot is through pulling the battery. On my Galaxy S i9000 you could hold Power + Home and it would reboot even if the phone was totally frozen
[Samsung Galaxy Nexus] aloy99:
same thing on my current phone. Doing battery pulls is a terrible pain if I have installed a protective casing.

@mrbig0 see what I quoted

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] RMatt1992:
If your whole phone freezes (shouldn't) then of course you have to do a battery pull regardless of the ROM you're running or what buttons you have...

o.O

^My experience, reading above apparently some phones do so. Regardless, I use my phone 10 hours + daily and have never had the whole phone freeze.
[Samsung Galaxy Nexus] bigmike2424:
To the OP, the phone never really freezes. Ive been with android since donut and this phone has been the most stable even with custom roms. I think I've only had one force close the whole month I've had the phone and it's never completely frozen on me. You dont have anything to worry about.
[Samsung Galaxy Nexus] aloy99:
not unless im doing overclocking, hackery and the like.

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] aloy99:
Not true. On my current phone, pressing a button combo will reboot the phone whether it's frozen or not. It's a hard reset.

Sent from my x10 mini running the latest version of minicm 7. :D
[Samsung Galaxy Nexus] bigmike2424:
thats true, i never mess with set cpu or set speeds, but if that's the case then battery pulls might be necessary haha
[Samsung Galaxy Nexus] 321jurgen:
I never have experienced it with the Samsung Galaxy nexus and I did crazy things.
[Android Software/Hacking General [Developers Only]] SpeacyL:
I would like to try a ROM.

Is there something "Rock Solid" and "noob ready" to go?

Thank you

Now I have gigner 2.3.3.
[Android Software/Hacking General [Developers Only]] jethru:
if u have the sgt-p1000, go to this awesome thread: http://xdaforums.com/showthread.php?t=1324528
[Android Software/Hacking General [Developers Only]] nabuhonodozor:
I would definitely disagree with installing MIUI. It is far from being rock sold stable.

For noob ready, rock solid I would recommend latest stock 2.3.6 which is rock solid and noob friendly.

Its here: http://xdaforums.com/showthread.php?t=1380595

Its great ROM, everything is working flawlessly, its fast and battery is very good.
[Android Software/Hacking General [Developers Only]] SpeacyL:
thanks.

ps: I think I have posted on a wrong section though
[HTC Sensation] baz2a:
Hello everyone,

I'm trying to compile my own source ROM for my Sensation 4g (TMOUS) My HBoot is 1.17.000 revolutionary unlocked. My compile from google source gingerbread 2.3.4 (to match version htc is using) went ok however with no lunch or envsetup option for the Sensation my full-user make showed compiling for generic. I have tried fastboot flashing my compiled userdata and system img files to my phone along with my default sense kernel (kernel from TMOUS rom 1.5 made from clockwork recovery) to find that it doesn't get past the white htc screen. I'm interested in compiling and sharing this ROM with the public however finding I'm a little lost on next steps.

In the court of public opinion, what would my next steps be? Is my lack of booting due to the sense kernel and instead should I try using a kernel like trinity cm7/asop kernel? Is my lack of booting even kernel related?

Any advice I would greatly appreciated and once I can get this thing running I will be glad to give credit where due and distribute any modified files. Also, if I run across any additional information that might help anyone I will update this post.

PS - I know ICS is out and it might seem odd to try with gingerbread to start (along with using 2.3.4 instead of 2.3.7) however my rationale is that by trying to stay as close to the gingerbread rom HTC provides version wise I might have the best shot at compatibility.

Thanks everyone.
[HTC Sensation] gol_n_dal:
Various ROM developers have IRC channels. It might be worthwhile trying and asking a developer on there, just don't bug them too much.
[Galaxy S I9000 Q&A, Help & Troubleshooting] TechActivist:
Hello XDA,

I recently acquired a Samsung Telus T959D Fascinate and have anxiously waiting for a ICS release.

In order to use ]teamhacksung's ICS Port for Galaxy S (BUILD 9) for my fascinate, I used >>This Thread<< to flash a i9000 kernel to use the ROM.

Now I am confused a bit. I've done some research on XDA and google, but for some reason can't get a straight answer on what to do in order to flash back a regular Samsung Fascinate ROM, such as CM7.1. I want to flash back, but I don't know which kernel to use because I am currently using the i9000 kernel.

I could flash one by Glitch and try CM7.1 from there, but I'm not sure what the voodoo lagfix option is and why it would brick my phone.

If any of you could recommend a kernel to flash to use regular Fascinate ROMs, and a kernel to use for i9000 ROMs, it would be greatly appreciated :D
[Galaxy S I9000 Q&A, Help & Troubleshooting] broncosfan007:
I would reccomend Lords kernel v 9.3 BFS. If you like I can send you the download.
[HD2 Windows Phone 7 Q&A, Help & Troubleshooting an] g4master:
anyone know of a working reg edit currently using (11.11.11 HD2O© v1.23b1 WP7 FINAL MANGO) with this xap but it opens and closes right away. even tried the xap in a emulator and it did the same.
[HD2 Windows Phone 7 Q&A, Help & Troubleshooting an] g4master:
end post found answer
[Galaxy S II Q&A, Help & Troubleshooting] stratdude83:
In order to sync your Facebook profile pictures to you contacts you must install and login to the Facebook app before your add your contacts from your SIM card. It seems that when the phone loads the contacts from your SIM card to your phone is when it sync's the profile pictures to the contact name.
[Galaxy S II Q&A, Help & Troubleshooting] Blancos4Lyf:
Or you can separately connect each name to an FB account
[G1 Q&A, Help & Troubleshooting] elharraq:
I have bought a g1 and before and after loaded Cos-DS wifi will not function.

in WiFi settings....when ticking the ON box, and it scanning for a few seconds it simply states ...........error

and when clicking wifi settings...then menu....then advanced....MAC address is unavailable.

another probleme.......the phone often lose the signal for a long time even if i do a restare or switching on off airplane mod.

this error seems to be harware....

any observations....please:(

so please can anyone help me by pointing me Where is the switching circuit module physically located in the G1. or any help i will appreciate it

Is there a fix?

Thanks in advance..
[G1 Q&A, Help & Troubleshooting] demkantor:
the wifi is located in the daughter board, that is the membrane where you will find the usb port. if it is a hardware issue than it must be replaced --- ebay maybe $15 -- but i would first test and see if any other roms will produce a working wifi connection.

if you need help replacing the daughterboard let me know and ill walk you through it.

david
[Asus  Eee Pad Transformer Prime] bigt305:
Hey fellas/ladies! I just got an Asus Transformer eePad, and me being a graphics type guy, decided to make a wallpaper celebrating both companies Google and Asus.

Hope you enjoy!

...and if anyone would like a resized one, post and let me know. And hit thanks if you like it!
[Asus  Eee Pad Transformer Prime] optimiss:
Haha that's pretty cool. Now I need my Transformer to get here so I can use it.
[Asus  Eee Pad Transformer Prime] ajholt7:
That is cool! Can't wait to get my prime and put this on it.
[Asus  Eee Pad Transformer Prime] Haro912:
How about a 480x800? For my revolution :-) until I get my prime lol
[Asus  Eee Pad Transformer Prime] scm_crash:
HAHA... Cute.
[Asus  Eee Pad Transformer Prime] ravizzle:
Nice

Sent from my Galaxy S2
[Asus  Eee Pad Transformer Prime] Haro912:
Set this as the wallpaper on one of the computers I use at school almost everyday haha. Looks awesome. Thanks a lot
[Asus  Eee Pad Transformer Prime] ericc191:
You should make a couple resolutions including 1920x1080 :)
[Asus  Eee Pad Transformer Prime] demandarin:
Thanks. how do you set e regular picture in gallery as a wallpaper w/o it cropping the picture and messing up the quality of resolution? It only does this with pics from gallery. all asus wallpapers set the whole image as wallpaper. it doesnt make you crop like from the gallery.
[Asus  Eee Pad Transformer Prime] Bizdady:
Ya I wouldnt mind rocking this on my desktop until my Prime comes in :D
[Asus  Eee Pad Transformer Prime] Angel7777:
I'm using on my iPhone...up yours Apple lol
[Asus  Eee Pad Transformer Prime] richaoj:
I don't think this is going to help with the Hasbro vs Asus trademark thing.

/joke
[Asus  Eee Pad Transformer Prime] mikepar:
Wallpaper

Did you remove this ? I would like a copy if possible ?

Can you optimize the attached for the Prime ? It would be much appreciated !!

Thanks.
[Samsung Epic 4G Touch] veritasaequita:
does anyone here maybe have a working profile.map that they have setup for playing gta3 via sixaxis app with ps3 controller. ive made a few attempts but just cant get one working right. maybe even point me to some resources that might help finally make a fully functional profile. thanks
[Samsung Epic 4G Touch] outlawstarc:
same boat here...