How to test your monitor for PWM (pusle width modulation)
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- Опубліковано 24 лис 2017
- In this video I will demonstrate how to test you monitor and see if it uses PWM to control the screen brightness. While this test isn't 100% accurate, it should give you a general idea of whether or not your monitor uses PWM.
Most useful and very eye opening information in this video.....i will never buy any pwm display ever since I'm suffering from my galaxy smartphone so badly, and i can easily tell its flickering
and how you find pwm free displays ??
Great video. Very clear and to the point. Thanks!
many thanks for the video and explanations!
really very helpfuk. many thanks.
greetings from berlin!
super neat trick! love it
Thanks man! Lower your camera exposure will enhanced the visibility of flickering. My laptop stop flickering at 10/15 brightness, 9/15 is flickering hard
Hi! Very interesting video! What are the actual model names of monitors you use in the video?
Most of the LED LCD monitors are using PWM to control screen brightness, it's just that the frequency is high enough not to be perceptible by human eyes including the HP one on the right.
I would say to most human eyes, it's not the same for everyone. If you're sensitive to flicker or learn what to look for and when it's possible to see, lots of monitor flicker will be visible. I have seen 240Hz flicker on Dell monitors. Lots of Samsung OLEDs use a mere 120Hz. A Panasonic VT30 Plasma TV used a mere 60Hz!
@@sniglom You're talking about refresh rate Hz vs PWM brightness flicker Hz. Those are two, different things you are measuring. The first is talking about the refresh rate of the images display while the second is talking about how brightness is monitored.
@@sublime_tv I’m not. Don’t assume.
Thank you for such an interesting video. Yet another cheap and more accurate method would be to use a solar cell (from an old calculator for example) and an oscilloscope.
How is an oscilloscope cheap??
Method with fingers worked perfectly and on my galaxy s6 there is a huge difference. While my laptop hp probook 455 screen looks like dont use PWM
s6 (as most oled displays on phones) has something about 230 hz.... many modern pc displays uses 1000-25000 hz. Its just too fast.
@@boagoa282 There is some science on shortest detectable light flash, it's somewhere around 1/500 of a second. Aiming for 1000Hz or perhaps double that, is what I consider the floor for a guaranteed flicker free experience. It's just mind boggling how much stuff that are way below 200Hz. Especially led lights.
Hi! Thanks for the info. Does strobing effect still appear even at high frequency? Let's say 10khz+.
The strobing effect isn't noticeable at high frequencies. That's why I had to turn the brightness down on the monitors when I did the test. At 100% brightness, the frequency was so high that I was unable to detect PWM.
Stefanus Hendri I did it today and don’t care what anyone thinks.
@@randomtech3533 No, actually the strobe frequency is the same unless it's 100% brightness. At 100%, there's no strobe and led stayed on all the time, at 50% there is strobing with half on half off at its designed frequency, at 75% led on for 75% of the time then of for 25%. The frequency is the same, the time led stayed on is changed, that's why it's called _Pulse Width_ Modulation not _Frequency_ Modulation.
@@thanhvinhle2893 i was Reading this thinking the same almost answering and then seeing it was 3y ago so i was like fuck it but then i saw your message good work
@@nocodenoblunder6672 ikr. But worth pointing out even though the video (and comments) are old.
How do i disable this? i got this new monitor for my birthday today but i get some eye strain :(
so this is why I'm having eyestrain whenever my laptop brightness is lower than 100%. Tested with my camera and 100% brightness does not strobe, but lower does
@twitch za There is software to make the brightness appear lower by chaging the colors. So you can set the brightness to 100% and have a flicker free experience and then use that software to show darker colors.
u can move your phone up and down and see the blurs moving
What do non pwm monitors use?
DC dimming
@@Elderhet Yeah latest OnePlus phones have introduced that feature too to reduce eyestrain
I am so lucky to possess a HP monitor.