Hello folks,
I have had my Note 2 for a couple of days now and almost immediately noticed something strange. There is a VERY subtle flickering of the white and light grey areas of the screen. A very high frequency flicker, almost like I can see the refresh rate of the screen. My initial suspicion was that the refresh rate was lower than 60hz. So, I downloaded the app called Android System Info, and sure enough, under display, it was being reported that the refresh rate of the screen is 58hz. I got another friend with a Note 2 to confirm the same thing. My GS3 reports 60hz, and so does my friends HTC One S. So my question is, why is the refresh rate on the Note 2 not 60hz? Is this an intrinsic hardware limitation? Or can this be changed with software? My eyes can definitely notice the 2 less frames per second, I was using a GS3 since June, and switching to the Note, I immediately noticed the refresh rate was lower. Why? This is very strange to me. There are many videos on YouTube with the Note 2 and GS3 on the screen at the same time, and sometimes there is banding interference on one phone and not the other, meaning obviously the phones are running different refresh rates. Now I know the Note 2 refresh rate is lower, why? And is there anyway to change it with software?
Thanks much!
first, i think u should get yr note2 to warranty,
second, u sure yr eyes can differentiate 58hz and 60hz......?
emprize said:
first, i think u should get yr note2 to warranty,
second, u sure yr eyes can differentiate 58hz and 60hz......?
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It is EXTREMELY subtle, almost a non issue, so I doubt warranty will even say anything is wrong. I can notice it on all the demo models i've seen, so I doubt it has anything to do with my phone.
I have confirmed on 3 different Note 2s, the reported refresh rate in the app 'Android System Info' is 58hz. While all other phones I have used report 60hz.
I just find this so strange that maybe someone has a great explanation as to why this is the case. And maybe someone can dig deeper than I can and figure out if this is in the OS or an intrinsically hardware thing. I wish I had the email of a Samsung engineer who worked on the design of this phone, would love their take on why this is the case. 58hz is just such a strange refresh rate.
Goontron said:
It is EXTREMELY subtle, almost a non issue, so I doubt warranty will even say anything is wrong. I can notice it on all the demo models i've seen, so I doubt it has anything to do with my phone.
I have confirmed on 3 different Note 2s, the reported refresh rate in the app 'Android System Info' is 58hz. While all other phones I have used report 60hz.
I just find this so strange that maybe someone has a great explanation as to why this is the case. And maybe someone can dig deeper than I can and figure out if this is in the OS or an intrinsically hardware thing. I wish I had the email of a Samsung engineer who worked on the design of this phone, would love their take on why this is the case. 58hz is just such a strange refresh rate.
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you are the man, mate, my eyes cant even differentiate 50 and 60 Hz, for all my note2 experience, i cant see any unusual on the screen.
But for the 58hz issue, i think its not quite a strange thing for me, it reminds me when i was using CRT monitor(or early lcd?), it always can set the refresh rate to 58hz or 60hz, but it might like u say a hardware or driver problem, hope u can contact with samsung engineer and tell us the answer
I suppose the app might be reading the values of somewhere not actually measuring it or something ! Correct me if am wrong .
this is interesting. i also notice a subtle flicker of the screen. it's annoying in some lighting. i don't notice it on other phones.. it's definitely seems like the refresh rate is a bit slower than it should be.
The refresh rate is correlated with the resolution and the main base clock which feeds the display controller, in this case 1280 * 720 * 58Hz = ~54Mhz plus some margins for which are too long to describe, which gives them a target frequency of about 54MHz for a 16 divider of the 880MHz base clock. That's the main reason of the 58 vs 60 Hz difference.
But the reason you're seeing flickering might be completely unrelated to that and caused by some odd much lower timings in the display settings. Maybe a developer with the device could test it out by changing them.
AndreiLux said:
The refresh rate is correlated with the resolution and the main base clock which feeds the display controller, in this case 1280 * 720 * 58Hz = ~54Mhz plus some margins for which are too long to describe, which gives them a target frequency of about 54MHz for a 16 divider of the 880MHz base clock. That's the main reason of the 58 vs 60 Hz difference.
But the reason you're seeing flickering might be completely unrelated to that and caused by some odd much lower timings in the display settings. Maybe a developer with the device could test it out by changing them.
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Thanks for that information, it's great technical info I've been looking for. So it's basically a ratio/multiplier of some clock speed in the hardware. But now my question is, why would the Note 2 be any different than a GS3? I would think they have relatively the same hardware, and resolution on both screens is the same, so why would the refresh rates differ? Just seems to me that 58hz is not an ideal refresh rate. I mean, the main reason there is a trend towards 120hz TVs these days is because both movies (24 fps) and TV (30 fps) are evenly divisible into 120. Whereas with a 60hz TV, there is a remainder on 24, so movies do not interpolate as smoothly. With 58hz, no recorded content I can think of divides evenly into it, always making interpolation less smooth. Again, in my mind, 58hz is just silly, why not just give me the extra 2hz!! Doesn't make sense to me.
Final question. Would there be any way with software to change the refresh rate? Or is this set in stone at the hardware level?
I have an issue with this as well - I'm getting either fairly heavy frame skipping in any 8 or 16 bit emulator with frame skipping set to auto, or sound skipping with frame skipping turned off. I suspect this is because of the odd refresh rate with the app expecting 60hz and only running at 58 in reality, causing either the video or audio to run out of sync and needing to skip the two frames here and there to catch up. If the emulators could slow down the audio speed to match the slower video speed, it wouldn't be an issue.... but this shouldn't be the problem of the emu authors.
This happens with no other applications installed on a brand new phone. I've also installed clean rom and perseus kernel, no change. Power settings are all off, nothing is hitting my CPU to cause the frameskipping and it's very consistent, which leans towards the refresh rate causing the issues. Anyone know anything more about this? What a pain...
I am a traffic cop and I can definitely tell the difference between a car going 58mph and one going 60mph.
Sent from my GT-N7100
@rbiter said:
I am a traffic cop and I can definitely tell the difference between a car going 58mph and one going 60mph.
Sent from my GT-N7100
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I'm a noob and I don't know what "stuttering" is
But seriously, it's not like a mobile device should be able to emulate another system anyway, am i rite? Just use it for phone calls and internet browsing...
i think the reason why the refresh rate between gs3 and note2 is different due to both are using different lcd even though some of the hardware is the same.
even though the diff is small but it still incur some major hiccup where the frame skip especially with project butter where they keep the ui at 60fps.
maybe we can email to samsung engineer and they can take a look at it.
It would be great if somebody can test it, thanks in advance.
How to test:
put a camera in front of the screen and play around with the shutter speed and the brightiness of the screen. When lines appears on the screen, its not good => pwm, without lines => good :good:
edit: i had links for pwm explanation, but not enough posts, sorry..
The question is about pulse width modulation, which I'm reading occurs when both of the following are true:
- you are using an LED light source with variable brightness
- you are using a camera with a rolling shutter
http://provideocoalition.com/aadams/story/pulse_width_modulation_is_not_your_friend/
The camera on the note 8 does not have an LED flash, so I think the poster either now knows that it won't be an issue, or is curious as to whether display brightness on the screen is controlled by pulse width modulation or a different technique.
In the latter case, I don't know, and since this is stuff that can't be seen by the eye nor in the viewfinder, but mostly in photo editing suites per the article I link to, I'm not sure why it's an issue here.
Hi roustabout
I think we dont speak about the same topic.
What I mean is the flickering of the display. A good example is found on youtube: Nexus 7: no PWM on LCD
A lot of LCD use this technology to dim, but its not proper dimming, just switch on / switch off the the lcd very quickly.
Some people have problem with this flickering but dont know that theres a problem, so for example dry eyes, getting tired very fast when working on the computer..
I think more the 95% of the usual monitors use this technique.
I hope this helps.
no, we're talking about the same thing:
'curious as to whether display brightness on the screen is controlled by pulse width modulation or a different technique.'
The article I found thinks it's not visible; what you've read or experienced suggests it's problematic.
What I can say is the first-gen ipad was very hard on my eyes; the note 8 is not like that, but not as good as e-ink. Much more fun than e-ink, though!
Hey guys. So I was at a restaurant earlier this evening and I was about to take some pics with my 5t when I noticed something really weird. Black vertical lines zooming from side to side on the image. The lighting was relatively dim and I noticed it stops when I focused on a white plate.
I tried with different camera apps and it kept happening. I took some videos to show you guys. I'm really hoping this is not a hardware issue because I'd hate to send the phone back.
Have any of you had these issues? Any thoughts?
Here are the videos:
And this one shows it happens with photos as well:
HALP
that ain't no issue. that's common on any camera.
It is the refresh rate of the screen and the lights not matching up. TV in the UK is broadcast at 24 fps, so lighting in the UK is tailored to match at 24hz.
you'll see those lines on poor light/LEDs on preview mode only. some camera apps have the option to change the hz from US to UK.
Abaddon said:
that ain't no issue. that's common on any camera.
It is the refresh rate of the screen and the lights not matching up. TV in the UK is broadcast at 24 fps, so lighting in the UK is tailored to match at 24hz.
you'll see those lines on poor light/LEDs on preview mode only. some camera apps have the option to change the hz from US to UK.
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I had no idea lighting could mess with the refresh rate of a camera. It's weird because the problem is not only on videos. When I snap a picture the lines are there also. Is that because of the refresh rate too? On a still image?
I too have the same problem
Abaddon said:
TV in the UK is broadcast at 24 fps, so lighting in the UK is tailored to match at 24hz.
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Excuse me but no. Standard TV is 50Hz, and I bet at least some HD channels transmit in 50Hz. Regardless of this the AC switching rate is 50Hz. Unless you're talking of another UK (I was referring to the one with the Queen).
Is this an isolated case or is it another oneplus problem like oneplus 5?
OrtizFerrari said:
Is this an isolated case or is it another oneplus problem like oneplus 5?
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It's not a problem at all... It's how cameras pick up certain lights since they refresh at different rates. Try recording a tv or computer screen. You'll likely see it flickering the same way.
mazdamiata210 said:
It's not a problem at all... It's how cameras pick up certain lights since they refresh at different rates. Try recording a tv or computer screen. You'll likely see it flickering the same way.
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Yes I know that differents frecuences could make interferences, but I bought the phone after a bad experience with the Oneplus 5 jelly and I'm worried haha Great to read that, thanks!
Just wanted to confirm that there's no issue. Tested with a Oneplus One and a Samsung Galaxy S5 camera. Both had the same effect under that lighting. I guess I learned something new.
Ok, could one moderator close this thread? Because someone can think that this is an issue of the phone...Anyway, I like to see that you've learned something new @Lord Zafakon
Hi,
is anyone having heating issues with display panel ?
I'm attaching a picture of the portion where the heat arise after use for a while.
location marked on picture.
always on 120hz refresh rate
I'm using galaxy s20 5G SM-G981U1
So it's hot there?
Maybe a display or component failure in progress.
Never seen that with a OLED screen.
If an internal component is getting hot enough to effect the display it will eventually cause it to fail.
Return for repair or better replacement.
blackhawk said:
So it's hot there?
Maybe a display or component failure in progress.
Never seen that with a OLED screen.
If an internal component is getting hot enough to effect the display it will eventually cause it to fail.
Return for repair or better replacement.
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not much heat, its like warm a bit. max 22°C
but in 60hz temperature remains normal
mohaiminulmunna said:
not much heat, its like warm a bit. max 22°C
but in 60hz temperature remains normal
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Maybe a power hungry flat pack under there and nothing abnormal about the temperature difference.
The display on the other hand doesn't look normal... that sucks.