How to test your monitor for PWM (pusle width modulation)

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.

[subhabratasaha]

Most useful and very eye opening information in this will never buy any pwm display ever since I'm suffering from my galaxy smartphone so badly, and i can easily tell its flickering

[yongsua]

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.

[donitoakbar]

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

[RS-wzef]

Great video. Very clear and to the point. Thanks!

[joecolchic]

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.

[alexanderfedorovich]

Hi! Very interesting video! What are the actual model names of monitors you use in the video?

[miskaknapek]

many thanks for the video and explanations!
really very helpfuk. many thanks.
greetings from berlin!

[StekChannel]

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

[thanhvinhle]

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

[SalehMumtaz]

u can move your phone up and down and see the blurs moving

[chaosbuilder]

How do i disable this? i got this new monitor for my birthday today but i get some eye strain :(

[anonekun]

Hi! Thanks for the info. Does strobing effect still appear even at high frequency? Let's say 10khz+.

[yongsua]

I am so lucky to possess a HP monitor.