I noticed that when I have Always On display at maximum brightness, the device turns on many random white pixels in the area that was supposed to be black, kind of simulating a LCD backlight.
It is noticeable by exposing the sleeping phone to a bright light so it will go to maximum brightness while Always On, then turning off the lights while the brightness is at maximum you can see the "backlight" (white pixels in the black area). As soon the phone adjusts the brightness you can't see it any more.
Here are some pictures, comparing maximum brightness, low brightness and also comparing to a S8.
https://imgur.com/a/pZgzT
Please note that by taking a picture makes it more evident, in reality it looks just like a LCD backlight, not a star constellation like in the picture. Even though it is not bad in reality I am concerned because this should not happen in a black screen in an OLED display right?
I tried replicating this with a regular image and I cannot, I can only see it while in Always On display.
Anyone else having similar issues with the regular Pixel 2? Or even in the 2 XL? I did not notice this happening when I had the 2 XL.
My blacks have always had that LCD type backlight look. I was wondering the same thing but I've seen others with it so I just assume it's the design. Not keen on it but it's not the end of the world for me
To me it only happens in always on display. If I have a black picture on my screen it doesn't show this "backlight"
Related
I posted this on the galaxy s forums too, but it seems a little dead there.
As seen by the NoLED app over in the (galaxy S) dev section, and in a few other places on the net, people are finding that when they display a black image on their amoled/samoled screens in a dark room there is still light emitted by the display. it is not truly black
I would like to know why!
One thing i hear is about image compression and signal noise causing the pixels to not display #000000 black and instead a variant of black/grey causing the pixel to become lit.
This problem is not an issue during the day, i can't tell the difference when my screen is displaying black or off. but what it does effect is battery life.
If the screen isn't powering down its pixels then it is not saving anywhere near as much power as it could do
Were we cheated of our true black?
My phone has the AMOLED. I did notice that I can see the backlight through a black screen, usually during boot up. It dosent really bother me. I didnt feel cheated or anything like that. The images look fine.
My phone could use better battery management, my MT3g battery spoiled me.
The odd thing is that there is no backlight on OLED displays - the light is produced by each individual pixel. It ought to produce true black as the pixels should be entirely off, producing no light at all.
The problem with your analysis is that your using a third party app to test this,
what if the code is messing with the display ????
best way to test this is to upload a black image onto your phone and keep it on for a few hours , now check if the display is consuming battery in the battery usage screen, report your findings here ?
Btw normal AMOLEDS differ from S-AMOLED , they don't have true black so they need to turn on the pixels in the display to display blacks.
They should be the same actually, same technology powering the pixels, same lack of a backlight.
I did my testing on the galaxy S with its super amoled, showing a true black bmp image and the screen is still lit.
There shouldn't be any reason to turn on pixels to display black - black is the absence of light, so creating light to display black is rather counterintuitive.
Pure blacks can't be expected from an LCD because the pixels have to block the light from the always-on backlight, but they ought to be achievable (as far as ambient lighting conditions permit) from an OLED.
I do wonder if this is something PenTile-related, but considering that's a technology designed for OLEDs, you'd hope not!
The PenTile display, iirc correctly, has a white subpixel. Maybe thats where the light is coming from?
ooo .... ooo .... ooo .... does that mean by default no more BLACK screen of death??
On a serious note, i'd find it odd that a program can screw up showing a black screen. Wasn't it usualy a case of (well in my day anyway!) poking #000000 to the "pixels" address? (or however many 0's you need for a true 16bit display)
it cant be because its a RGBW display because each led can still be turned off. there still is no backlight.
Also i doubt its RGBW, most likely RGBG
android53 said:
Also i doubt its RGBW, most likely RGBG
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Yeah, pretty sure it's RGBG. RGBW is a different PenTile layout.
omg you all need a life or a star trek convention to go to lol
AndroHero said:
omg you all need a life or a star trek convention to go to lol
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you DO know YOUR on a geeky phone forum, right?
(Sadly though, i think you are correct!)
AndroHero said:
omg you all need a life or a star trek convention to go to lol
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My life is my phone, and the next StarTrek convention isnt until August 13th in Nj, so until then well debate about screen pixels and how black is black on an AMOLED.
Are you guys using true black? In CMKY terms true black is not 100 100 100 100, or RGB terms 0 0 0. That means 100% color of each of the 3/4 colors. In the printing industry if someone chooses black like this from the color pattern it comes out as greyish black in print.
Heres a good artcle that should help you guys make a true black image in photoshop.
http://www.andrewkelsall.com/the-professional-designers-guide-to-using-black/
Hopefully after reading this you will find that the tests people are using and the color black are very volatile. First make a true black image, then test from there.
maxpower097 said:
.... In the printing industry if someone chooses black like this from the color pattern it comes out as greyish black in print.
...
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A black is easily achieved in assembler (and i'm assuming therefore in C) by simply setting the pixels on the bitmap to 00,00,00 (maybe a few more zero's for more colour range?). This is the "true" black of a device.
i used photoshop to get a high quality uncompressed RGB 0 0 0 bmp image.
the screen is still lit
android53 said:
i used photoshop to get a high quality uncompressed RGB 0 0 0 bmp image.
the screen is still lit
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I'm wondering if thats the best way to test it. If your viewing your image you created in PS it could be rendering it into colors like 1,0,0 , or 0,0,1, etc.... I would imagine you would need to write a program that actually sets each pixal at 0,0,0.
Problem
The display on my s3 mini is not showing true black but a feint gray shade and it has few curved lines that are COMPLETELY BLACK...I'm wondering if I can make the whole display black as there is nothing wrong with the screen...I was unable to capture this on camera as it was too dark
I'm kind of late to the party but...
I saw that problem on my Samsung Galaxy Express (similar to S3) but I moved away from Samsung for a few generations. Now on my A52 I saw the same "problem".
Turns out it's the eye confort shield that turns the screen dimmer and yellowish, it was messing with the true blacks. I disabled it and couldn't see anything at all it was pitch black.
Not sure if that was the problem with my old Galaxy device... But it makes sense that when you notice it the most, is when that eye protection is active.
Hope this helps anyone
My new Nexus 5 seems to have some backlight light bleeding around the top right corner. It's only visible when displaying blacks in the dark. Is this normal? Do your Nexus 5s also leak light?
Below is a photo example of mine. I am in dark room with brightness set to 100%
The Nexus 5 uses a LCD display. ALL LCD displays will have a certain level of light bleed. The amount will vary from unit to unit, depending on the quality control in the manufacturing process, but the only way to avoid it completely is to stay away from LCD displays, and opt for an OLED display (like a lot of other phones have). Because this is considered normal, the light bleed would have to be VERY severe for Google to consider it a defect.
There's a trade off though. LCD displays have light bleed, resulting in a low contrast ratio, but they can be seen very well in bright light, and typically have better color reproduction than their OLED counterparts. So, one technology isn't necessarily "better' than the other, it just depends on which one suits your needs better. If light bleed bothers you far more than, say, not being able to see the screen in bright sunlight, then the Nexus 5 may not be the best choice.
Got my OnePlus last night and generally I love it. But I have one showstopper that I'm hoping has a fix that I just don't know about. Is there something wrong with my phone, or is there a fix, or is the problem with me that I’ve become perverted by AMOLED?
See, I use my phone to read at night before bed. Lights totally off, and the black background is just not black, it's grey. My last two phones are a Galaxy S4 and Galaxy Nexus, both of which have AMOLED screens. From what I've read, the AMOLED has a very deep black because apparently the lighting is per-pixel, so the pixel is literally not even on when black is on the screen, right?
So when I read at night, the lit pixels are a deep amber orange, and the black pixels are...black. On the OnePlus, the deep amber orange is washed out (comparatively), and the black pixels are...grey. This is pretty much indistinguishable if there's any visible light in the room, but at night with all the lights off, it’s very obvious since I’m used to the AMOLED black. This shows up in both my ebook reader, Moon+, and in Chrome and Gallery when downloading a "pure black" photo. I even use a program, Screen Filter, to dim the screen down below the lowest brightness setting, but the black background is still too bright for me. And yes, it’s there without Screen Filter.
Again from my reading on this, I seem to find that LCD screens (which the OnePlus has) light the whole screen for their backlight, so this may be pretty much inevitable. Is this accurate?
I’d post a photo, but in the kind of low light conditions I’m talking about, no photo would show that kind of contrast. At least no photo I know how to take.
PS - This does not appear to be the "yellow screen" problem I've been reading about. The colors seem consistent from top to bottom. But I'm not very good at color distinguishing.
Any help is appreciated! Thanks!
You're just used to AMOLED displays, the blacks on those are much deeper because it's not actually lighting up when it's displaying black, it's displaying nothing at all. This is because there's no backlight, each pixel is made up of three LED's, so when it's displaying black none of those LED's are firing up. An LCD display is completely different, even when it isn't really displaying anything (black) it's being lit up by the backlight. There's nothing you can do about this.
Transmitted via Bacon
timmaaa said:
You're just used to AMOLED displays, the blacks on those are much deeper because it's not actually lighting up when it's displaying black, it's displaying nothing at all. This is because there's no backlight, each pixel is made up of three LED's, so when it's displaying black none of those LED's are firing up. An LCD display is completely different, even when it isn't really displaying anything (black) it's being lit up by the backlight. There's nothing you can do about this.
Transmitted via Bacon
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What he said.... the OP can adjust his screen settings accordingly to emulate a "AMOLED" experience as previous phones such as N4,N5 has done this.
http://forum.xda-developers.com/showpost.php?p=54321008&postcount=6 try those settings it might satisfy the OP when it comes to blacks being blacks and not gray
Hey guys!
I have a question to you, owners of the Galaxy S7. As we know from other threads Galaxy S7 uses PWM to control screen brightness. I am interested in this phone and it has been my favourite to buy. I read many reviews and I was really satisfied for what I saw. And then I entered the Notebookcheck's review of S7 and realised what PWM is. As a result... I have very big question mark when it comes to buying this phone. PWM is seem to be a big defect for me, it's hard to believe that such a company can release a phone, which can produce headaches and eye strain or even make flickering visible to some group of people!
Some people say it's a big problem, but reviewers excluding Notebookcheck don't even mention that and say it's a perfect screen. So I have a question to you - what is the truth? Can you see the problem, do you feel bad after using the screen for a long time, is it possible to see flickering at 236 Hz? Thanks in advance for you answers!
No you can't see flickering
You'd have to be super human to see flicking at 236Hz, most PC LCDs are 50-60Hz and you don't see the flickering, florescent lights are 50-60Hz and you can only just see it if the bulb is dying
*Detection* said:
No you can't see flickering
You'd have to be super human to see flicking at 236Hz, most PC LCDs are 50-60Hz and you don't see the flickering, florescent lights are 50-60Hz and you can only just see it if the bulb is dying
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Sorry Detection, but your comparisons fail in this case. What LCD screens have is a 60 Hz refresh rate (or higher for e.g. gaming displays). That means, that the screen content is refreshed/output 60 times a second. But the backlight is not pulsed. It is constantly on. You would really notice a 60 Hz on-off-pulsing of the backlight.
Flourescent lights have an afterglow, and are driven by a 50 or 60 Hz sine wave AC. So it doesn't go off and on instantly.
I own a Galaxy S7 myself and I do notice the flickering. Some people are more sensitive in perception than others. I notice it with different strength in different situations. The dimmer the screen brightness is set, the more it is noticable to me. I assume, it's because of pulse width ratio - the dimmer the brightness is set, the shorter is the on, and the longer is the off time. And it is more noticable to me with bright font on dark backgrounds than the other way round. I'd really say, that this is the biggest disadvantige of Samsung's OLED displays. On my former S3 it was also noticable to me, even stronger due to a lower frequency. But I'd say, I can live with it - I really like the vivid colors of these AMOLEDs on the other hand.
It would be interesting to know if the brightness control of OLED displays of other manufacturers is done the same way, or if there are other techniques existing
Edgar_M said:
Sorry Detection, but your comparisons fail in this case. What LCD screens have is a 60 Hz refresh rate (or higher for e.g. gaming displays). That means, that the screen content is refreshed/output 60 times a second. But the backlight is not pulsed. It is constantly on. You would really notice a 60 Hz on-off-pulsing of the backlight.
Flourescent lights have an afterglow, and are driven by a 50 or 60 Hz sine wave AC. So it doesn't go off and on instantly.
I own a Galaxy S7 myself and I do notice the flickering. Some people are more sensitive in perception than others. I notice it with different strength in different situations. The dimmer the screen brightness is set, the more it is noticable to me. I assume, it's because of pulse width ratio - the dimmer the brightness is set, the shorter is the on, and the longer is the off time. And it is more noticable to me with bright font on dark backgrounds than the other way round. I'd really say, that this is the biggest disadvantige of Samsung's OLED displays. On my former S3 it was also noticable to me, even stronger due to a lower frequency. But I'd say, I can live with it - I really like the vivid colors of these AMOLEDs on the other hand.
It would be interesting to know if the brightness control of OLED displays of other manufacturers is done the same way, or if there are other techniques existing
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You're seriously telling me you can see something flashing at 236 times per second? Sorry but no
I'm one of the persons that if the screens have a low refresh rate I get headaches and get tired, however since long time gone with technology this doesn't happen. I don't have any issue with the phone and use it sometimes hours in a row and for a full load of operations. Car navigation, social messaging, reading news and articles and internet searches. No issue at all for me and it's been a great screen. I use however a 3M privacy film, so it lowers the quality of the screen.
I use this phone in my Gear VR where it is a inch from my eyes and I don't notice any flickering. The screen is great!
It is great, no doubt. But, believe it or not guys, some people do recognize the flickering
How is the LCD's black levels? Also at the lowest brightness.
SaladEsc said:
How is the LCD's black levels? Also at the lowest brightness.
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Hi. I got the device today and I'm fairly impressed with the black levels from this LCD display. Even with low brightness.
The panel, at least mine seems pretty homogeneous and viewing angles are good.
Ah, and I'm coming from an amoled screen (Samsung A71).
well thats brilliant and reassuring thanks Patoilo , I ordered mine a day ago and my context is as a movement and cognition impaired (light and sound sensitivity,reduced memory) disabled dude I keep inducing burn in on OLED displays after 1 year to 18 months AND the PWM brightness moderating method plus pentile subpixel arrangement all mess with my vision and comfort when trying to read. I was super excited to see this combination of 120hz, LCD, big battery etc - the physical size is the only draw back but its mitigated by the reliability of both the screen robustness (not going to burn in or discolor over time) and the fact this thing should last a long time even if I had to go to hospital halfway through it charging
Ill report back about the display when the phone arrives especially stuff like how pronounced any ghosting is at 120hz, how nice the 1080p+ clarity is now that im not on Pentile etc
Im very impressed with the display, coming from a oneplus3 oled, this display is so much better.
Colors are much more vibrant, black level is good and the display is massive in size.
Watching movies in 21:9 with the dual speaker is insane.
One think to note, with "dark mode" enabled it changes multiple colors like white to dark grey, yellow to dark orange etc. so dont keep that always enabled.