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U3219Q, PWM, not flicker free
I just received one of the new Dell U3219Q monitors. I had bought it thinking that it was in fact flicker free since the product page on Dell website says so. Immediately upon starting to use it i started experiencing eyestrain and headache. I can literally not stand to look at it, even though I try hard to accept it. As it turns out, it's not in fact flicker free as demonstrated in this review. It's even a pretty low frequency PWM signal at 200Hz. People who are concerned with PWM will only be made aware of this if they are suspicious enough to look at the certificate from TUV and assume that they don't in fact consider flicker to be anything other than visual flicker, which is ridiculous. How on earth can Dell get away with this?
chavlji
2 Posts
0
March 13th, 2020 12:00
Just bought it and it’s 100% flicker-free as advertised. Manufactured on November 2019.
I haven’t noticed any flickering at all (I am very sensitive to it), so I did a simple test:
Prepare black screen with 1px wide vertical line in the middle. Set camera (RX100 v1) to manual mode (iso 200, F2.5, manual focus) with exposure 1/25. Quickly drag camera horizontally and shoot while dragging.
Flickering is clearly present on my cheap Samsung 2253LW: https://ibb.co/2PkzLFX
On U3219Q gray rectangle is perfectly even so light has the same intensity throughout the shot (brightness at 30%): https://ibb.co/J3bYQmn
If your statement would be correct in 1/25 of a second, at 200 hz there should be exactly 8 brighter and darker vertical areas evenly distributed over gray rectangle.
hakapes
6 Posts
0
March 30th, 2020 06:00
chavlji
2 Posts
0
March 31st, 2020 12:00
@hakapes Rtings is really the only one claiming it flickers with 200Hz and everyone else is just repeating that and at the same time admitting they can't notice it.
How can you explain my findings? 200Hz is really low frequency. If it is strobing, a decent camera (I think RX100 qualifies) should catch it without a problem (as it did on my other cheap display)?
I'm not saying Rting's unit isn't flickering, but mine clearly isn't. The only explanation that comes to my mind is that Dell silently changed the manufacturing process?