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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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Click to collapse
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
No, I'm not trying to sell washing powder, just trying to understand an issue I've had now with two Pixel 2 devices, and one that I posted about on the colour saturation and accuracy thread on the Real Life Review boards previously.
My first Pixel 2 arrived in December and I was immediately underwhelmed with the colour balance on the display - regardless of configuration options. Whites were very yellow - not as bad as when the Night Light was on, but far from white. So I returned the device, and a new one arrived a few days later. My second Pixel 2 is undoubtedly much better than the first. Not only was the colour balance better, it was also noticeably sharper when compared side by side. However, it still has a definite yellow tint in the whites, and some images seem to show this more than others - for example, flesh tones in the otherwise superb photos (when viewed on the device) look odd.
It's most noticeable for me when I have a nearby monitor or screen to compare. Individually the phone does not look so bad, but the whites on my monitor, laptop, tablet and even old phones are significantly whiter. (I'm not helped by the fact that I work in front of a screen all day - so I'm rarely able to avoid the comparison.)
Hence the question - both my devices have had a distinct yellow tint in the whites. How about yours?
I'd really like to keep the phone - because pretty much everything else about it is great. However, it's not a cheap phone, and because of that I'm not sure I should be making such a compromise on the display.
Any feedback appreciated.
I went to Best Buy and looked at the Pixel 2 they had there, and it had a similar yellow tint to the one I had that I RMA'd, but I don't think the tint was as bad on the one at Best Buy as it was on the one I had.
To get a comparison I just loaded the Play Store app (white background) and compared to a sheet of laser printer paper I had on my desk (under fluorescent lighting in my office). I'd have say my whites were a bit colder (i.e. less yellow) than the paper appeared under these lighting conditions.
I tried changing colour mode, but that didn't seem to have a dramatic effect on the white point, though "saturated" looked a little different - I'm not sure whether I'd describe it as "warmer" (more yellow/less blue) or just having slightly more green, but there was a very small change in colour temperature in that mode. I use "natural" myself anyway.
Large Hadron said:
To get a comparison I just loaded the Play Store app (white background) and compared to a sheet of laser printer paper I had on my desk (under fluorescent lighting in my office). I'd have say my whites were a bit colder (i.e. less yellow) than the paper appeared under these lighting conditions.
I tried changing colour mode, but that didn't seem to have a dramatic effect on the white point, though "saturated" looked a little different - I'm not sure whether I'd describe it as "warmer" (more yellow/less blue) or just having slightly more green, but there was a very small change in colour temperature in that mode. I use "natural" myself anyway.
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Click to collapse
Thanks for the feedback.... I'm using natural mode too - boosted, or saturated just make the whites more yellow for me. It's subtle - but noticeable.
I've also noticed yellowish whites comparing it to other screens. Even my old N6P had better whites. I don't know if it's a generalized issue we should worry about, or just stick with it.
Enviado desde mi Pixel 2 mediante Tapatalk
It's just how these screens were tuned. They are much warmer than LCD screens and look yellow when u compare to basically any other display. It's a feature, not a bug. Stop comparing and you won't notice it ?
PuffDaddy_d said:
It's just how these screens were tuned. They are much warmer than LCD screens and look yellow when u compare to basically any other display. It's a feature, not a bug. Stop comparing and you won't notice it
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Click to collapse
You're right of course, I need to stop comparing... I just got a bit paranoid after my original RMA'd device's screen was so poor. I think I'm going to stick with it.
Hi,
My Note 20 ultra has some Display problems.
When my phone is on a lower brightness and Adaptive(120Hz) refresh rate setting on a grey background, I can see all sorts of funky horizontal lines across it.
(except gallery - i think the refresh rate reduce to 60hz in gallery automatically so in gallery you can't see the problem).
I see them big time on settings screens or Apps where there is a gradient of gray.
see the attached Picture. Two pics with 120Hz(Adaptive) Display Refresh Rate and others with 60hz!
Note: the problem seems to be more than real in these pictures because of camera, with eyes you can't see such this bad!
Any one here with this problem?
Is this something wrong with the phone? Or is that normal?
60
saidgta said:
Is this something wrong with the phone? Or is that normal?
Click to expand...
Click to collapse
normal for amoled screen
saidgta said:
Is this something wrong with the phone? Or is that normal?
Click to expand...
Click to collapse
You have a defective display get it replaced ,& no this isn't normal with oled screens
You can see the lines with your eyes or just with the cam?
Normal for a cam image... try decreasing shutter speed, a lot.
blackhawk said:
You can see the lines with your eyes or just with the cam?
Normal for a cam image... try decreasing shutter speed, a lot.
Click to expand...
Click to collapse
I can see with eyes but very rare, just when the screen is on 120 Hz and lowest brightness. On 60Hz everything's ok!
saidgta said:
I can see with eyes but very rare, just when the screen is on 120 Hz and lowest brightness. On 60Hz everything's ok!
Click to expand...
Click to collapse
Is that in a completely dark room?
If you're not using a incandescent light source for room lighting that may cause it.
Otherwise regardless of screen brightness or display frequency it should be not be showing anything except what's being displayed.
At that price it better be spot on.
Yes, that's in a completely dark room.
The horizontal lines is static, not moving. And you can see just in Gray Backgrounds with lowest brightness and 120hz.
screen lines
Hi. I just got my Note 20 Ultra and I have the same problem. I see streaks in my photos. If I switch between 60 and 120Hz, sometimes the lines disappear, but not always.
saidgta said:
Yes, that's in a completely dark room.
The horizontal lines is static, not moving. And you can see just in Gray Backgrounds with lowest brightness and 120hz.
Click to expand...
Click to collapse
Not good. Was thinking maybe background LED lighting might be "strobing" it.
Probably a firmware issue but could hardware is my guess.
Maybe software... try clearing the system cache on boot menu, a hard reboot and clearing graphic driver data even if it reads zero. If you have PD MDM use that to clear instead of in Settings.
Mine does the same. I think they all do it some people just don't notice it.
coilbio said:
Mine does the same. I think they all do it some people just don't notice it.
Click to expand...
Click to collapse
Yes, I know someone that replaced the phone, but new phone has the issue too.
coilbio said:
Mine does the same. I think they all do it some people just don't notice it.
Click to expand...
Click to collapse
Do you normally use that low a level at night?
I have excellent center vision; my 10+ goes dimmer than I will ever use. No flicker or color anomalies though.
It may be the physical hardware limits of the device or they may eventually patch a firmware flaw.
They also may have inadvertently set the lower limit of the brightness too low...
If it doesn't effect night usage I might ignore it.
Samsung can be notoriously slow at fixing firmware/software glitches in their products.
Amazingly even after almost 2 years they are still patching both firmware and software on the original Buds. They now perform much better then a year ago. Crazy.
blackhawk said:
Do you normally use that low a level at night?
I have excellent center vision; my 10+ goes dimmer than I will ever use. No flicker or color anomalies though.
It may be the physical hardware limits of the device or they may eventually patch a firmware flaw.
They also may have inadvertently set the lower limit of the brightness too low...
If it doesn't effect night usage I might ignore it.
Samsung can be notoriously slow at fixing firmware/software glitches in their products.
Amazingly even after almost 2 years they are still patching both firmware and software on the original Buds. They now perform much better then a year ago. Crazy.
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Click to collapse
Frankly it's always visible since I know what to look for. when I'm not looking for the it, it's when it's really annoying to see.
I have a note 9 and a 10+ which I still daily drive both on their own sims. The difference in screens is very noticeable. The 120 hz mode is the problem. Put the phone in full resolution and it's way better.
The screen on the n20u is less vibrant than my other notes, but it's more color accurate so I like that.
coilbio said:
Mine does the same. I think they all do it some people just don't notice it.
Click to expand...
Click to collapse
coilbio said:
Frankly it's always visible since I know what to look for. when I'm not looking for the it, it's when it's really annoying to see.
I have a note 9 and a 10+ which I still daily drive both on their own sims. The difference in screens is very noticeable. The 120 hz mode is the problem. Put the phone in full resolution and it's way better.
The screen on the n20u is less vibrant than my other notes, but it's more color accurate so I like that.
Click to expand...
Click to collapse
That's seems annoying. Guess using a lower frequency at night be the easiest solution. Sammy throws out a lot of betaware that needs more work...
On the 10+ Pie the display settings are goofy for screen mode. If you set it to "vivid" it's way oversaturated. Natural is the best setting but you have little ability to dail it in much more than that.
I'm curious about these controls on the 20U and Q.
Any improvement?
blackhawk said:
That's seems annoying. Guess using a lower frequency at night be the easiest solution. Sammy throws out a lot of betaware that needs more work...
On the 10+ Pie the display settings are goofy for screen mode. If you set it to "vivid" it's way oversaturated. Natural is the best setting but you have little ability to dail it in much more than that.
I'm curious about these controls on the 20U and Q.
Any improvement?
Click to expand...
Click to collapse
Honestly don't notice a difference switching between the two in n20u, on note 10+ yes big difference.
So I tried the green slider mod setting where you dial it all the way down under advanced display setting.
Its not much of a difference, it does reduce it a little. The screen becomes purple dominant obviously but the green fringes still show.
coilbio said:
Mine does the same. I think they all do it some people just don't notice it.
Click to expand...
Click to collapse
coilbio said:
Frankly it's always visible since I know what to look for. when I'm not looking for the it, it's when it's really annoying to see.
I have a note 9 and a 10+ which I still daily drive both on their own sims. The difference in screens is very noticeable. The 120 hz mode is the problem. Put the phone in full resolution and it's way better.
The screen on the n20u is less vibrant than my other notes, but it's more color accurate so I like that.
Click to expand...
Click to collapse
coilbio said:
Honestly don't notice a difference switching between the two in n20u, on note 10+ yes big difference.
So I tried the green slider mod setting where you dial it all the way down under advanced display setting.
Its not much of a difference, it does reduce it a little. The screen becomes purple dominant obviously but the green fringes still show.
Click to expand...
Click to collapse
On the 10+ the color sliders are weak too.
A 3rd party overlay app works but is a pain.
Overlay apps won't work with Q though I believe.
Rather sloppy of Goggle and Samsung... this is an ongoing issue with Androids; no color calibration
Fortunately the 10+'s aren't too bad but it the color blind coders need to get up to speed...
Androids need color calibration.
OLEDS are horrible sceens, but similarly to screen-to-body ratio we have brightness race now, a useless but review-happy attribute which does help your eyes only in very rare situations. Otherwise it makes your eyes tired with pulsing. For use in dark these screens are bad. You will also got ugly backbleeding as a bonus. Horror movies are unwatchable.
I have this with each phone nowadays, and there's no escape from it. I can see the lines on Note20U too, of course. It even blinks when you're tired. The backbleeding is rather uniform tho and not so intensive.
Funny as I use mobile 90% in dark, i prefer dark mode, and i like dark movies Killer trio.
doggydog2 said:
OLEDS are horrible sceens, but similarly to screen-to-body ratio we have brightness race now, a useless but review-happy attribute which does help your eyes only in very rare situations. Otherwise it makes your eyes tired with pulsing. For use in dark these screens are bad. You will also got ugly backbleeding as a bonus. Horror movies are unwatchable.
I have this with each phone nowadays, and there's no escape from it. I can see the lines on Note20U too, of course. It even blinks when you're tired. The backbleeding is rather uniform tho and not so intensive.
Funny as I use mobile 90% in dark, i prefer dark mode, and i like dark movies Killer trio.
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Click to collapse
It's not the OLEDs that are the issue as the display on my 10+ is the best display I ever used.
It's the firmware/drivers and perhaps the >60 hz hardware. It's very disconcerting that it's not sorted out yet.
Well that's Samsung. It may be fixed. Samsung just pushed out yet another Buds+ firmware update today. Wow. They keep trying, I'll give them that... the best the Buds+ ever sounded.
So there's hope. The bad news is it will most likely need to be a firmware update if it is fixable.
Flashing the Buds is a lot easier (and less risky) than patching the bloody phone firmware.
Based on issues like this and the abomination that Q and above are, I may simply buy another backup 10+ 512gb phone running on Pie and call it good for the next 3 years.
Both Samsung and Goggle/Android have been practicing drop the ball like drooling kindergarten ftards lately
saidgta said:
Hi,
My Note 20 ultra has some Display problems.
When my phone is on a lower brightness and Adaptive(120Hz) refresh rate setting on a grey background, I can see all sorts of funky horizontal lines across it.
(except gallery - i think the refresh rate reduce to 60hz in gallery automatically so in gallery you can't see the problem).
I see them big time on settings screens or Apps where there is a gradient of gray.
see the attached Picture. Two pics with 120Hz(Adaptive) Display Refresh Rate and others with 60hz!
Note: the problem seems to be more than real in these pictures because of camera, with eyes you can't see such this bad!
Any one here with this problem?
Click to expand...
Click to collapse
I have same issue..! Have you sorted out this issue!?
So I've had the Note20 Ultra 512 GB since release last year. Image retention has always been there, but never resulted in burn in so I ignored that. However, now the screen uniformity is getting worse. The area around the fingerprint sensor and a rectangle about half an inch around the edges of the screen are a different darkness level. It's very visible on gray screens and medium colors at any brightness. I also have an S20+ that is not exhibiting any of the issues I see here. I remember having my Note 9 under neon lights and the half inch ring was noticeable, but could not be seen in normal lighting or dark environments. I was hoping to pass this phone to a family member when the S22 Ultra comes out, but I have concerns about screen longevity. Anyone else noticing this?
See this for an example:
https://www.reddit.com/r/GalaxyNote20/comments/l0svom
The S22U is worse from what I'm seeing; a lot of display issues. Display just going black after a reboot or charge, whatever... dead as Zed.
Plus no SD card slot, no native spen and running on the dog OS Android 11. All that for a premium flagship price. Yes, well...
What brightness level are you running it at?
Use it in direct sunlight except occasionally for a few seconds?
I keep my N10+ at less than 50% about 99% of the time. I use dark mode and near black wallpaper. Minimum red icons. Mostly because I prefer not burning out my eyes but also OLED preservation. I use manual brightness control only.
At 2 years my heavily used 10+ shows no display degradation even compared to my new one.
See what you, use ScreenTest to make sure you actually have any changes with the display. You really shouldn't. If you been conservative with your brightness and you have degradation it's likely a design and/or manufacturing fubar.
Samsung runs hot and cold. This year has been a bad year for Samsung.
Next year isn't any better plus Android OS is tanking. Even if Samsung does manage to pull a Note out of their assets, I'll wait a year to buy it.
See what kind of feedback it's getting and if the Android OS completely turns into a sour green Apple
I punched out and went with a know good workhouse for the next 2-3 years. I just wasn't liking what I saw... and the 10+'s just keep on ticking.
blackhawk said:
What brightness level are you running it at?
Use it in direct sunlight except occasionally for a few seconds?
I keep my N10+ at less than 50% about 99% of the time. I use dark mode and near black wallpaper. Minimum red icons. Mostly because I prefer not burning out my eyes but also OLED preservation. I use manual brightness control only.
At 2 years my heavily used 10+ shows no display degradation even compared to my new one.
See what you, use ScreenTest to make sure you actually have any changes with the display. You really shouldn't. If you been conservative with your brightness and you have degradation it's likely a design and/or manufacturing fubar.
Samsung runs hot and cold. This year has been a bad year for Samsung.
Click to expand...
Click to collapse
Using it at 40-50% brightness. The screen looks fine in decent lighting, but in a darker room I can see the shaded areas clearly. When using a light theme or pure black, everything looks great as well. I just find it odd how much more noticeable artifacts are on these screens than on the S20+ and Note 9.
Guyinlaca said:
Using it at 40-50% brightness. The screen looks fine in decent lighting, but in a darker room I can see the shaded areas clearly. When using a light theme or pure black, everything looks great as well. I just find it odd how much more noticeable artifacts are on these screens than on the S20+ and Note 9.
Click to expand...
Click to collapse
That's not excessive...
The ScreenTest app will help you see what is degraded. Blue pixels tend to degrade first, red last.
is the original screen protector still on?
raul6 said:
is the original screen protector still on?
Click to expand...
Click to collapse
The US models don't come with screen protectors. The glass has held up decently with only 2 tiny hairline scratches that are only visible in sunlight.
Guyinlaca said:
So I've had the Note20 Ultra 512 GB since release last year. Image retention has always been there, but never resulted in burn in so I ignored that. However, now the screen uniformity is getting worse. The area around the fingerprint sensor and a rectangle about half an inch around the edges of the screen are a different darkness level. It's very visible on gray screens and medium colors at any brightness. I also have an S20+ that is not exhibiting any of the issues I see here. I remember having my Note 9 under neon lights and the half inch ring was noticeable, but could not be seen in normal lighting or dark environments. I was hoping to pass this phone to a family member when the S22 Ultra comes out, but I have concerns about screen longevity. Anyone else noticing this?
See this for an example:
https://www.reddit.com/r/GalaxyNote20/comments/l0svom
Click to expand...
Click to collapse
Wow I have exactly the same issue. Exactly the ring and rectangle above. I thought it was because of some image that created such a high contrast, but since you have the same issue then it's a hardware issue.
And it's only visible on some shades of grey. Not on black, not on white. So strange
since many devices have the same burn-in pattern, do you believe it has something to do with its internal components (rather than the display's pixels)?
Like the charging circuit for example?
This problem is getting much worse and is now visible at all times regardless of brightness. It likely will result in an unusable screen soon. I will try reaching out to Verizon and/or Samsung to get a resolution. This is totally unacceptable for a phone that only been used a little over a year. Here is what it looks like at 50% Brightness, and 10% Brightness. The Note 9 and 10 Plus lasted over 2 years with no such problems.
Is anyone's pixel 6a having a green tint issue. I bought a pixel 6a (japanese set) and noticed the screen, even on a white screen, looks significantly greener than other phones, which I'm ok with because it is consistent across the screen. However, at minimum brightness (when I was using it at night in a dark room), the top part of the screen shows an even more severe green tint.
Also, the camera viewfinder seems to lag (low frame rate) and has high noise level even when compared to my pixel 3. Sadly the image quality post-processing isn't significantly better either. A little disappointed because I was expecting decent upgrade without having to burn a hole through my wallet.
The seller that I bought from is willing to do an exchange and I will be heading down soon, but just wondering if anyone else is having the same issue. Hopefully this is an isolated issue and doesn't affect a whole batch of pixel 6a users out there.
Note:
I have tried changing every display setting,
updated to the latest Android 13 firmware and also done factory reset multiple times yet the issues persist.
Dont got that massive green Tint, as i got my Phone, on first start there where alot green Pixels around the Camera Punchhole. After Setting up everything , they disappeared.
Good you can replace it...seems like an HW Issue.
Return it that is not normal
This is a hardware issue, you should never see that much magenta or that type of striping through a camera. The green is as bizarre, but visible to the naked eye. A refund or exchange is in order, I would personally be wary of the seller should they try to give you another phone instead of a refund.