Many newer (2021+) models on the market have this certificate. Anyone have tried these, and is it a real deal or a marketing ploy again?
TUV Low Blue Light/Eye Comfort Certification: does it make any difference?
EyeDiscomfortCertificate Forgive me for not having any links handy, but others on this forum have claimed that some devices under TUV certification have PWM flicker, LCD inversion and other issues.
TUV was also the lab that was contracted in the Intel "eye strain investigation" and they weren't able to detect anything "wrong" with their measurement equipment, so that's another possible strike against them.
Conclusion: Don't bother strictly with certifications.
JTL Yes I agree, that TUV are not perfect, but it is still interesting if I should at least weakly prefer the devices with certificate or ignore it altogether. It seems that at least their blue light certificate is pretty strict.
EyeDiscomfortCertificate Without knowing the criteria involved with the certification I feel I cannot comment further.
JTL Yes, it is not open (which is strange), but, from what I've seen in the open access they require to move blue light peak more toward the green band, and cut down everything below the 450 nm. And, I was wondering, if someone has compared TUV-certiied and non-certified ones and have some conclusion to share.
EyeDiscomfortCertificate Most screens just use a PWM frequency of 3000+hz(for example 9875hz) and are therefore flickerfree. They dont test every brightness setting, only some of them, there can be low frequency flicker on lower brightness, it will still get a certificate.
Translation by Google:
flicker free
TÜV Rheinland has tested this product to determine whether the display flickers visible and invisible to the human eye, causing eye strain in the user.
To this end, TÜV Rheinland has defined a test catalog that sets minimum standards in various frequency ranges. The test catalog is based on international or industry standards and goes beyond these requirements.
The product has been tested in the laboratory according to these criteria.
The keyword "Flicker-free" confirms that the device does not exhibit visible and invisible flicker in the range of 0 - 3000 Hz at various brightness settings as defined in this standard.
I use Xiaomi Pad 5 which has TUV Rheinald Certificate and i can affirm that it has zero flicker. What's the most important thing to know is that usually, OLED screens use PWM ( even if is high frequency, the PWM is there ) while IPS screens ( with TUV ) has zero flicker ( flicker free) .
I switched all my devices to top IPS screens and my eyes are way more relaxed 
After reading some material, I kinda came to conclusion that:
1. TUV Eye Comfort is not a reliable metric, due to loose PWM testing criteria.
2. However, TUV Low blue light is actually a different story, the have very strict definition of it and probably
worth taking into consideration
a year later
The vast majority of monitorbrand, including OLED, IPS, VA, TN uses PVM. Meaning the higher brightness the higher/faster pulse and less flicker.
But as soon as you adjust the brightness to lower levels or applaying e.g. eco view, meaning the monitors sensor recognizes lower ambient light and therefore lowers brightness, the pulse gets lower and flickers starts to occur.
My collegues dad that has severe issues after a stroke, has tried a lot of monitors. The only brand he can sit in front of is EIZO.
They seem to have a hybrid techique.
4 days later
Bjorns That is not true at all. Virtually none monitor manufacturers left which use PWM. Only some Samsung models come to my mind. Everyone else: Dell, HP, Acer, LG, Benq you name it - none use PWM anymore.