How to test my LCD monitor for Subpixel Flicker?

and What to do about it

Click the image below to open it in Fullscreen mode

How to test my LCD monitor for Subpixel Flicker?

If this doesn’t work use and if you want to share this image on your website later use the link below – LCD Subpixel Flicker Test

On most monitors, this test should work but in order for your eyes to see the effect more clearly, you may need a black background

In this case right click the link above and click and click Open Link in New Tab from the menu

If you don’t see any visible flicker or pulsations with the first test, set your Browser to Fullscreen mode and open the second test in a New Tab – LCD Subpixel Flicker Test with Bigger Black Background

What to watch for?

One of the eleven boxes may flicker slightly

ObserveΒ for up and down movement or a pulsation of the box

What to do about it?

If you don’t see any noticeableΒ movement you are really lucky

If your monitor also has Blue light control and doesn’t use PWM for controlling the brightness you Iris can help you with automation of the blue light and the brightness

However, if you see movement or pulsation in one of the boxes Iris is a total must for your eye health.

There are 2 ways in Iris to fix the Subpixel flicker

Blue light to Zero

One is to set Blue light to 0%, there is preset type in Iris called Sleep type which can do this

Biohacker type should also fix the issue and will invert the colors to reduce the light emitted from the monitor even more

Making the screen Grayscale

You can also fix this problem by making the screen Grayscale

In Iris, there is Reading type which will do exactly this

It will also reduce the blue light and brightness automatically

Test again

Now if you try again with any of the methods above you should not see any flicker or pulsation in the image

Here are photos from my Iris




Tell Friends

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 peopleΒ to learn about this

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

14 thoughts on “How to test my LCD monitor for Subpixel Flicker?

  1. Greetings! I just took the subpixel flicker test. I started with Iris set to Health and one of the boxes was flickering. Then I moved it to Reading, expecting no flickers, but now two of the boxes were flickering. What’s going on?

      1. Thanks for responding. I had already set brightness to 100%. I checked and it still was. I took the test again and boxes 1 and 5 still seemed to be flickering (in Reading mode). But when I take off my glasses (for myopia) and look really closely at the boxes, they are not flickering. Perhaps it is my eyes doing this? Or my glasses? Or my brain? Strange. Anyway, I’m so glad and grateful I found Iris. Will certainly buy it.

        1. Well, you can try Autoconfig button on your monitor if you have it, but if you don’t see Subpixel flicker at Health use it on Health mode πŸ™‚

          1. Hi Daniel,
            In Health mode, numbers 1, 4a, and 5 appear to flicker. But again, when I remove my glasses and look closely, I see no flickering.

            I’m not sure what you mean by the Autoconfig button on the monitor, or what to do with it. I have an older MacBook Pro and in Systems Preferences it does allow me to choose various monitor settings, including some that limit the blue light. But it seems Iris does a better and more thorough job.

          2. By Autoconfig I mean one button on old monitors which moves the picture and tries to calibrate the X and Y position of the picture

            Subpixel flicker occurs when colors change fast so even if the test moves a little Reading mode removes subpixel flicker

            The goal of the test is for people to see what actually happens but when you use your computer it’s not like looking at test

            All modes of Iris reduce Subpixel flicker but Reading, Sleep and Biohacker completely remove it

    1. What do you mean by that? Iris should cover your screen. If you want you can send me a mail with more details about the problem and a screenshot of what’s broken and we will fix it πŸ™‚

  2. Hello there!
    In the test I found one panel flickering. In settings I then changed Sleep, Biohacker and Reading, each in turn.
    In all three the flicker stopped but instead, the panels had little balls of light, some just had one only. All slowly drifting downwards.
    Is there an answer to that event.

  3. “In Iris, there is Reading type which will do exactly this…

    It will also reduce the blue light and brightness automatically”

    I don’t get it, in the reading type the blue light is automatically set to 5000k, the highest right? And the brightness to 100%. Can you explain me that?

    1. 5000k is during the day

      No, the maximum is 6500k

      During the night Reading type is 3400k and 80% brightness

      Basically, if you want to remove all blue light use Sleep type πŸ™‚

  4. wow. I am lucky!! This rarely happens but I apparently have an excellent monitor. I’m very grateful. Thank you for this. I did both tests to be sure.

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