yashsingh1/xdaforums huggingface dataset:
[Galaxy Note 4 General] rj3005:
incandescent light do afterglow resulting in a lessened brightness drop however a Fluorescent light with magnetic ballast near 100% brightness drop*.

In a movie projection the light is cut completely once, twice (or three times) por frame by the shutter** resulting in a complete dark screen, 24, 48 or 72Hz. hence the amplitude of the brightness drop is 100%

*Fluorescent fittings using a magnetic mains frequency ballast do not give out a steady light; instead, they flicker (fluctuate in intensity) at twice the supply frequency. It can cause a strobe effect posing a safety hazard in a workshop for example, where something spinning at just the right speed may appear stationary if illuminated solely by a fluorescent lamp.

** The shutter is a small, propeller-like device that rotates 24 times per second. Each blade of the shutter blocks the path of the light as it comes to a certain point in its revolution. This blacking out is synchronized with the advancement of the film so that the light doesn't project the fraction of a second when the film is moving from one frame to the next.
[Galaxy Note 4 General] sonyfan12:
I have not talked about projectors and fluorescent light
[Galaxy Note 4 General] Osmic:
I concur, why are we talking about fluorescent lights? Or movies. The movie flicker is not that sharp and it is not a flicker of full white to full black all the time. Aso it is 24 t0 48 Hz, so completely different thing than 240 Hz. This is a wide spread issue, but still rare. Based on the discussion I'm reading from various places, most people who have this problem, do not have any problems with lights or movies. My assumption is that it's a combination of two things: The slow flicker frequency and the fact that lights glow before going to completely black.

Therre are people who have had to quite their job because the workplace had replaced the lights with LED lights that flicker.

But I suspect still, that most people do not get problems form the slow flicker of 24 to 60 Hz. The higher flicker frequency, especially with LEDs is the problem.

Many, including myself have had their eyes checked by eye doctors and the eyes are fine. Though my eye doctor did admit that the optic nerve can sense this flicker and for some people it an cause problems.

So this is not an allergy or dry eyes, absolutely not. Has been confirmed by eye doctors and display manufacturers.

Also - why would one get dry or allergic eyes only after 15 mins looking at a 240 PWM display, but have no problems when that same display is set to 100% brightness when it does not flicker???

We can take a challenge - I can do a double blind placebo controlled trial and if that demonstrates that there is no difference in the results if there is a PWM or not, I'll pay the opponent 10 000 €. And vice versa.

But this is easily observed by taking a look at my eyes as they get red with a PWM display in minutes.
[Galaxy Note 4 General] xxaaronxx:
*sigh*

I'll just reinstate my points:

• Some people see flicker.

• Some people don't (Hooray!)

• There could be a bunch of reasons it's more apparant on the Note 4 LED display in comparison to other similar displays and differing technologies.

• Unless you're an expert with many years of science/medical/optics/electrotechnical background, please don't try to argue that it doesn't exist because you can't notice it, or that X technology doesn't do it with X refresh rate with a full X nanoseconds of blackness so the Note display

certainly

won't show any flicker either.

• It's not just the eyes that allow you to see the flicker, it's also the brain.

• Having 20/20 vision means jack ****.

• If you can see the flicker, no, you don't have to go to the doctor. Ignore anyone saying this.

• It could be fixed in software. (Has anyone confirmed flicker on Lollipop?)

And finally I'll just add: I love my Note 4 and I wouldn't use any other phone despite this issue. I don't always notice it. Under certain lighting conditions (Often in Sunlight) I notice the flicker more, but I'm slowly starting to ignore it completely and just getting used to it. I still think it's a problem that needs to be addressed however.
[Galaxy Note 4 General] nohcho:
Im with you on the PWM flicker, i had to give up on samsung galaxy devices because they cause eye strain in 30 mi and i get terrible headaches. My galaxy s4 dis it and the note 4 as well. Otherwise great devices but are unusable to me. My primary phone is xperia z3 and i have no issues with eye strain whatsoever
[Galaxy Note 4 General] Osmic:
Hey - great to hear that Z3 also does not have flicker. My Z2 is starting to give up and I'm looking for a new one. It does not guarantee anything that it is Sony, as the same happened with Galaxy S2 and S3. S2 did not flicker, but S3 did, badly.

So maybe my next phone is the Z3. Though at this point I'd like to wait for z4... but I think there was some rumours that Sony would stop manufacturing smartphones and the Z4 would be delayed...
[Galaxy Note 4 General] sefrcoko:
No idea what you're talking about! I get over 6 hours SOT with only a few frozen apps that I don't use anyways. This is the first phone I ever used where I actually don't care about squeezing extra battery life out by underclocking or undervolting, etc. Battery life is fine as long as you obviously don't use max brightness and run full sync of all apps or crazy stuff like that.

The only other problem you mentioned is PWM which again only affects some users and isn't specific to this phone.

Don't trash one of the best phones simply due to user error (not understanding how to identify and remove rogue apps draining battery, or buying a phone with PWM when that is something that you can't live with). Just to be clear, I'm not denying that PWM affects some people in a negative way... I'm just saying if that's the case then the Note 4 obviously isn't for you. Buyer beware.
[Galaxy Note 4 General] bekasulaberidze:
I had Note3, Note II I'm not satisfied with this device, I "understand" everything, brightness at 10% frozen many apps, what the hell is wrong with this phone -1% in 1minute
[Galaxy Note 4 General] sefrcoko:
Hmm would need to also see a few more screenshots of battery stats (screen on time, history usage) to really judge... What rom/kernel are you using? Have you changed governor or tweaked kernel in any way? Any mods installed? It could always be a rogue app draining battery too. In that case use Walelock Detector or betterbatterystats or gsam from the Play Store to identify the culprit. If you need help post the screenshots and answers to these questions on the battery life thread and you'll be good to go :)

Battery life thread:

http://xdaforums.com/showthread.php?p=55788816
[Galaxy Note 4 General] bekasulaberidze:
it's stock KK ROM rooted and greenfield almost everything, sot is max 2 hours, using only mobile data when needed. everything is turned off sync gps nfc....
[Galaxy Note 4 General] Varkut:
I have the same issue. I have bought galaxy s5 a few days ago and it is very difficult to use it more than 20 min . My eyes are tired very much!

My previous phone was galaxy s2 and I have no any problems with it.

Now I have found some solution. Application ScreenDim helped me.

I have used such settings: bright 100%, contrast > 24%

Here is result:

Brightness control by phone default:

ScreenDim:

As you see, there is no pwm effect after ScreenDim . I can't to make professional diagnostic, but my eyes feels much better.
[Galaxy Note 4 General] sefrcoko:
Ok like I said post that info along with the three battery stats screenshots to the battery thread I linked in my previous post. I can assure you 2 hours SOT is NOT normal. I got over 5 hours SOT right out of the box before even rooting or installing custom roms/kernel. Please go to the battery thread for help to resolve your issue so we can stay on topic here in this thread. :)
[Galaxy Note 4 General] nohcho:
I can attest to this, dimming the screen helps alot with eye strain and consequently the headaches, it definitely is more pronounced when the screen is brighter. Problem is, the amoled needs to be cranked all the way to see anything on screen when outside
[Galaxy Note 4 General] sonyfan12:
LG G Flex 2 - No Flickering!

http://www.ixbt.com/mobile/images/lg-g-flex2/oled-mod.png

Fly Tornado One - No flickering!

http://www.ixbt.com/mobile/fly-tornado-one.shtml#display-test

Galaxy S6 Edge - Flickering

https://www.youtube.com/watch?v=4BVgqzdQbls

Galaxy S6 - Flickering

https://www.youtube.com/watch?v=nH6hACRiU7s

Samsung Galaxy A5 - Flickering

http://www.ixbt.com/mobile/images/samsung-galaxy-a5/oled-mod.png

Samsung Galaxy A7 - Flickering

http://www.ixbt.com/mobile/images/samsung-galaxy-a7/oled-mod.png

Yotaphone 2 - not bad pwm, but flickering

http://www.ixbt.com/mobile/images/yotaphone-2/oled-mod.png

Fly Tornado Slim - Flickering

http://www.ixbt.com/mobile/images/fly-tornado-slim/oled-mod.png

Oppo R5 - Flickering

http://www.ixbt.com/mobile/images/oppo-r5/oled-mod.png

Nexus 6 (already wrote, but without picture) - not bad pwm, but flickering and low max brightness

http://www.ixbt.com/mobile/images/nexus-6/oled-mod.png
[Galaxy Note 4 General] Cocos20:
Mine does not flicker from what i can tell, have any other of you experienced it on a daily basis?
[Galaxy Note 4 General] sonyfan12:
"Brightness adjustment carried out by adjusting the voltage on the LED backlight. Rather, used PWM (its more economical regulate voltage), but it has a high frequency, and also in front of the LED standing the power smoothing filter. As a result, regardless of the intensity backlight does not actually flickers."

http://www.ixbt.com/td/macbook-pro-retina-display.shtml
[Galaxy Note 4 General] SquirtingCherry:
thanks for showing us a PWM used in retina LCD displays, but......what has this to do with amoled?

i mean a diesel and gasoline engine they are both engines and do the job but work diffrent
[Galaxy Note 4 General] sonyfan12:
PWM used only in macbook LCD retina display. LCD smartphones uses sample and hold.

You're wrong. In this case doesn't matter LCD or amoled.
[Galaxy Note 4 General] rj3005:
It matters everything, lcd has a backlight which is just a bunch of white leds where you can use any pwm frequency to adjust the brightness independently of the lcd screen refresh.

Witg Amoled the display pixels themselves produce light, that means the pwm frequency is closely related to the screen refresh. In order to doyble the pwm frequency the pixels will have to written twice as fast to the display.
[Galaxy Note 4 General] sonyfan12:
No. Amoled and lcd smartphones display refresh rate is always 60 Hz, and PWM can be with a 120/240/400/600/5000Hz etc frequency. it's just a flicker frequency (which may not be, if the amplitude of the brightness does not drop to zero)
[Galaxy Note 4 General] rj3005:
While (LCD) backlight frequency can be any value this is not the case with display technologies without backlight.

IF PWM is used in OLED displays it will function in simular manner as Plasma screens where each frames is drawn multiple times (sub frames) in order to give each pixels it´s desired luminance; see http://www.cnet.com/news/what-is-600hz/ for an explanation. The subframe/pwm frequency has to be a multiple of the screen refresh rate 60/120/180/240...600/660 ect.

However I just found some presentation slides about AMOLED from Samsung ( http://wenku.baidu.com/view/0b1933fd0242a8956bece43c.html ) and according to these papers AMLOD uses a (analog) sample and hold system (Slide 6) , luminance of each pixel is set pixel rate by setting an analog voltage and is maintained while rest of pixels are drawn.... this means that actually NO PWM is used.
[Galaxy Note 4 General] Toss3:
Why have people given this thread 2/5 stars? There's no conflicting info here - only facts. The screen does indeed flicker as has been proven by many people in this thread already, and while some are susceptible to it others are not. The latter group should thus refrain from using personal anecdotes as evidence for the first group being in the wrong.

Must say I hadn't really noticed it before actually checking it carefully and comparing it to my 120hz monitor that doesn't flicker. Nothing we can do about it right now, so if you are susceptible there's no other option than to sell your device and buy something that doesn't flicker (it doesn't bother me enough to sell my device).
[Galaxy Note 4 General] GTCC:
I can't see it looking directly at the screen but if I look at it through the camera on my tablet I can see what looks like waves of dark lines running down the screen, is that what people that are susceptible to it can see? If it is then that would drive me mad looking at it all the time.
[Galaxy Note 4 General] sonyfan12:
Plasma and repeating frame here is not the topic.

You are wrong as usual. There is not written about sample and hold, it is only your guesses

1) If there was a Sample and Hold there would not be flickering (as in the OLED TV and somr LCD screens)

2) "One interesting technical development is that the latest OLED displays use digital Pulse Width Modulation to specify the brightness of every sub-pixel."

"Plasma and DLP displays also use digital Pulse Width Modulation, but the OLED displays perform better because of higher frequencies and faster response times."

http://www.displaymate.com/Galaxy_S4_ShootOut_1.htm

also watch other amoled smrtphones review in displaymate

3) http://www.ixbt.com/mobile/samsung-galaxy-s5.shtml

http://www.ixbt.com/mobile/samsung-galaxy-note4.shtml

use google translate and watch other amoled smartphones in this site

and this site http://news.smartphone.bg/review

4) "OLED displays use digital pulse width modulation to produce their intensity scales and the red, green, and

blue luminance levels. This makes it possible for them to precisely vary and digitally control the intensity scales, gamma values, white points, color calibration, and management of the display in firmware or software. Many OLEDs, including the Samsung Galaxy Note II tested here, have started to take advantage of this functionality by providing several display modes with different color gamuts and white points. I hope to see this extended in future OLED products. LCDs, on the other hand, are non-linear analog devices, so accurately varying or changing their many calibration parameters is more difficult. It can be done, but requires different hardware configu rations and additional factory calibration."

"Most consumers are not aware that LCDs are actually non-linear analog displays that perform really well only as the result of highly refined electronics and careful factory calibration"

Without PWM can not be done switching between Adobe rgb and srgb profiles .
[Galaxy Note 4 General] sonyfan12:
Updated the requirement-suggestion for Samsung. Instead of "good" PWM make the same as they do in the Samsung KE55S9S. That is, sample and hold with their proprietary frame interpolation system that improves motion resolution up to a maximum without flickering and without unnatural motion rendition in 24/30 fps video.

Noterio, please fix this post in the starting post.
[Galaxy Note 4 General] auminous:
Screen flicker(pwm)

Andrei : is it true for the general case of phones ? or is it possible to change the drivers not to use pwm ? because some backlight chips(like some from TI) definitely support pwm-free modes.

---------- Post added at 11:37 PM ---------- Previous post was at 11:29 PM ----------

Are you sure this is true ? because this measurements of the samsung j5(with super amoled) does show pwm in the emitted light:

(i can't post links, newbie, but you can find the info if you search "samsung j5" laptopmedia.com pwm )
[Galaxy Note 4 General] AndreiLux:
It's not an on/off switch. It requires lots of reverse engineering.
[Galaxy Note 4 General] auminous:
Have you looked at the data i refered ? is something wrong with it ?

it's goo . gl / 0koJmX , remove spaces. Please have a look.
[Galaxy Note 4 General] Sunporta:
Solve this for me

This terrible effect I seen on my old Motorola Droid Maxx (AMOLED).

Now I buy Droid Turbo 2 and see same my eyes killer effect.

Googled and found this thread.

THANK YOU VERY MUTCH to user Varkut post about ScreenDim app.

Now I found very good app "Midnight" (mokaware):

+ my eyes now feel very good

+ same battery usage (chek Ampere app)

+ image more smoothly

+ color filtres (example yellow color for eyes and brain relax before sleep)

WHY WE USE this terrible pwm effect? Another brain experiments or maybe most people don't care and don't see it, don't know..

Any way I very happy now in this solution.

Tags for searching this message on ru users: OLED мигает, мерцает, AMOLED, oled экран мигает, шим регулировка яркости, мигание, яркость, глаза устают.
[Galaxy Note 4 General] Andreuz:
Lets bump the thread :)

Backlight PWM is obviously a big issue, I notice it all the time on my laptop and on my Samsung S4 mini.

On the laptop I tried to alter the PWM frequency - and it does work, but the flickering is still visible even at 800 Hz. So now I do not bother doing it as anyways I mostly use it with an external screen.

Samsung, on the other hand, bothers me much more; it is impossible to use it in darkness with a low brightness level (especially in cars or buses), the image just blurs when the smartphone moves. PWM is really a deal breaker for Samsung phones, if you plan to use them for prolonged periods of time in low light conditions.
[Galaxy Note 4 General] aaroncmx:
Let's hope the Note 6 solves this issue along with the many others. This was a huge issue when I first got my Note 4 around a year ago but I've somehow slowly become immune to it. I can't see the flicker at all anymore, however when I mess around with my friends Note 3, I can

instantly

tell there's a difference.
[Galaxy Note 4 General] Babakkardan:
This thread is very helpful to me. Is there a list of phones compiled which do not use PWM? Anyone have experience with the Moto X 2014? Moto X Play?

There is also the factor of Temporal Dithering/Frame Rate Control.... usually controlled by the GPU. I have read NVidia GPU does not do FRC... and list of phones which run on NVidia GPUs? Thanking you all.
[Galaxy Note 4 General] note4you:
I finally understand what's been causing my double vision!

I've been baffled for years why 10 minutes on my Note 4 gives me vertical diplopia (double image in both eyes) that takes about 20 minutes to go away. If I look at my phone any longer than 10 minutes, sometimes the double vision blurring takes all day to go away.

My computer monitor used to cause a similar vision blur issue if I was on it all day long, but using a blue light filtering program made that issue go away completely. Even with blue light filtering apps, my double vision problem on the Note 4 never got the slightest bit better.

So, it looks like PWM flickering is causing the problem. I can't see the flickering at all, but my eyesight starts to blur very quickly, every single time. Having found this thread, I now know what kind of devices to buy and which ones to avoid.

Sorry to resurrect an old thread, but this was the right place to leave this comment, so fiddlesticks.
[Galaxy Note 4 General] halop2k:
you can use these apps for DC dimming ;-)

[APP] AMOLED PWMfree

Summary: A simple application that uses a transparent overlay to dim the device brightness, effectively removing PWM. Download PWMfree More Information: Why PWM is such a headache Brief explanation about PWM Default brightness control...

xdaforums.com

OLED Saver - Apps on Google Play

This app solves the problem of flickering of AMOLED screen on low brightness

play.google.com
[Xperia Z1 Compact General] czachapll:
Hi ! I need stock camera app to flash in recovery. Thank You.
[Networking] nonentity:
anyone here knows if there's any wifi program that can let me configure "WEP LEAP" setting?

thanks in advance...
[Networking] wifihack:
My Cingular 8525 has a wireless LEAP tab. But I don't use it.

What do you have? What do you want to configure?

LEAP should set the encryption key automatically.
[Huawei Ascend Mate 2] GT1873:
My wife's old iphone 4 seems to take way better low light pics and video (HAM2 camera is jittery when taking low-light video, not smooth at all) Are there any camera tweaks to be done? any settings to change? Thanks!
[Huawei Ascend Mate 2] ScoobSTi:
The B148 update supposedly helped a bit, but I haven't tested it yet. But if you've already updated, I'm afraid there's not much else to do.

Phones like ours are cheap for a reason, meaning they have to be "bad" somewhere. Cameras are never good on Androids of this price range.
[Huawei Ascend Mate 2] GT1873:
That's cool, I understand. I guess the majority of pics & videos happen outside in the light anyway. Thanks. p.s. I figured out how to silence the camera and video camera sounds using ES file manager, so that's good.
[Huawei Ascend Mate 2] ScoobSTi:
Ooh cool, mind sharing? :D
[Huawei Ascend Mate 2] GT1873:
Sure. I followed this link and scrolled to the bottom where it talks about rooted devices. You're basically just adding a small addendum to the camera sound file names in the system. Works for me, but who knows what the long-term effects will be. Do this at your own risk, I take no responsibility for your actions. Do not do this if it is illegal in your country, check your laws.
[Huawei Ascend Mate 2] RobbH:
Some third-party camera apps will give you additional options, like higher ISO, that are not available in the stock Huawei camera. lgCamera has been mentioned in another thread here. I'm partial to OpenCamera. Paid options like A Better Camera provide additional modes. But even with all these options, I think the limiting factor for low-light photography with the HAM2 is focus. It becomes very uncertain in anything less than bright light.
[Huawei Ascend Mate 2] ScoobSTi:
Sweet, it works! You should make a thread for it, I reckon. :)
[Huawei Ascend Mate 2] GT1873:
Will do.
[Huawei Ascend Mate 2] bob60626:
I work sports leagues and tournaments and get a lot of teams asking me to take their picture. Sadly, it seems that ANY iPhone takes better pictures than anything I've dragged out there. In order of my use- Optimus V, Samsung S2, Note 2, and a Nokia 520; also a few small tablets, usually wrapped up on the beach so no pictures there.
[Huawei Ascend Mate 2] mke1973:
Once I realized that the HAM2's camera software doesn't allow flash when in HDR mode, I began looking at other camera software on Google Play. I recently bought Open Camera. It has so many more options, including flash when in HDR mode and a night mode. Here are photos taken on a walk today taken in HDR mode with the phone software and Open Camera.

Phone Software

[IMG="Phone software"]http://pic100.picturetrail.com/VOL686/13357565/24581311/410211331.jpg[/IMG]

[IMG="Phone software"]http://pic100.picturetrail.com/VOL686/13357565/24581311/410211330.jpg[/IMG]

Open Camera

[IMG="Open Camera"]http://pic100.picturetrail.com/VOL686/13357565/24581311/410211327.jpg[/IMG]

[IMG="Open Camera"]http://pic100.picturetrail.com/VOL686/13357565/24581311/410211328.jpg[/IMG]

I'll get some photos in night mode over the weekend and post them.
[Sony Xperia ZL] melquisedec:
I have installed this ROM (CARBON-KK-UNOFFICIAL_odin_build35.zip) then I installed lightning kernel stock .283 Version 5. The phone work fine for many hours, but it overheat, and the battery drain too fast. I put it to charge, I turned on my phone, so far so good, I made I video call and the phone overheat too much and turned off by itself. Now when I try to turned on it, the phone turned off automatic, I can connect it in Fastboot and Flashmode, I could install the stock ROM via flashtool, but the phone turn off after show the logo. I can flash a recovery and I can get in, and re-flash other roms but after the logo the phone turned off. What can I do? put it on the trash? :mad: :crying:
[Sony Xperia ZL] chiquin2008:
help someone the same thing happened with me was using the beta4 paranoid and did the flash of lightning to cm11 kernel and now my zl only works plugged into the charger .

already tried going to stock by flashtools have not solved the unlocked bootloader

someone help please
[Sony Xperia ZL] megladon:
did anyone find a solution ??

thnx