How to test my Monitor for PWM flicker?

and What to do about it

There are several devices which you use the test your monitor for PWM flicker but I want to show you something simpler.

The test below is based on a simple moving line on your screen.

You need to test your monitor at MAX hardware brightness and at MIN hardware brightness.

By hardware brightness, I mean to change the brightness from your monitor or laptop buttons.

PWM flicker test

Bellow you can see a white line moving really fast.

We will use this to determine if your monitor has PWM flicker or no at both max and min brightness.

I will tell you what to look for but first a little intro on

He aha ka PWM flicker?


PWM flicker is a cheap way that manufacturers use to control the brightness of the screen by adding some breaks without light.

holo nōhie, on a given interval your monitor is OFF then after some milliseconds ON again.

Our brain is slow and we don’t perceive this but we get huge eye strain and eye pain from this.

This is one of the main reasons why our eyes hurt in front of the computer.

Because of this constant ON and OFF of the backlight our eyes contract all the time like this

This is why PWM flicker causes so much eye strain and is undesirable.

Most monitors flicker only when the brightness is lowered so when the hardware brightness is at 100% there is no flicker.

This is why my recommendation when you download Iris is to set your hardware brightness to the MAX and control the brightness with Iris.

Iris uses another method to control the brightness which doesn’t cause eye strain and eye pain.

What to look for?

Depending on how you see the moving line you can determine if your monitor uses PWM to control the brightness.

If your monitor doesn’t use PWM you will see a smooth moving line like this

You can test this by setting your hardware brightness to 100%.

When your hardware brightness is set to 100% your monitor doesn’t use PWM in all cases and you should see this smooth line.

Now set your hardware brightness to the minimum possible value.

If your monitor uses DC dimming instead of PWM the test line should look smooth like this

If your monitor uses PWM to control the brightness you will see multiple lines on the screen separated by some space like this

What to do if my monitor uses PWM?

1. E hoʻopaʻa i kou kanaka hoʻoponopono Lako paʻa'ālohilohi i 100% ka hoʻohana 'ana i kou kanaka hoʻoponopono pihi.

2. E ho ohana i Iris to control the brightness without PWM

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If you liked this article and you learned new things about why we feel eye pain in front of the monitors

If you want more and more people to learn about this

If you want your friends to protect themselves from the monitor harmful rays and emissions

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Posted ma Articles, Testing

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