A strobing timing problem? (ViewSonic xg270)

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TommiL
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Joined: 17 Mar 2021, 15:38

A strobing timing problem? (ViewSonic xg270)

Post by TommiL » 17 Mar 2021, 16:34

Hello there!
I might be asking a rather naive question here, but I haven no clue what this particular phenomenon means. I just bought the Blur Busters-certified XG270 HD monitor, and so far it looks great, but does it need any more optimization. I have updated GTX 1060 GPU drivers and firmware.
I just shot a 120fps slow motion video of a UFO Flicker test via phone, which reveals some strange crossing line that blends the number frames together for some odd reason. I also have photos of NVIDIA settings to show.
test.mp4
(1.9 MiB) Downloaded 107 times
IMG_20210317_224922.jpg
IMG_20210317_224922.jpg (107.24 KiB) Viewed 1510 times
IMG_20210317_224939.jpg
IMG_20210317_224939.jpg (202.61 KiB) Viewed 1510 times
Some other settings:
Monitor HZ limit: 144hz
PureXP: Ultra

PS. Just in case I apologize for some occasional errors in English.

Tommy L.

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Chief Blur Buster
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Re: A strobing timing problem? (ViewSonic xg270)

Post by Chief Blur Buster » 17 Mar 2021, 17:16

TommiL wrote:
17 Mar 2021, 16:34
test.mp4
It's camera fault.

That's just the camera frame rate out of sync with refresh rate. If the camera is 120.007fps and the monitor is 119.9978536 Hz, there will be some slow slewing effect.

This happens to all cameras on all monitors, they're never perfectly synchronized like atom clocks.

The bar is simply an interaction between camera sensor scanout and display scanout (Even when you're videoing a strobe backlight, not all pixels on a camera refresh at the same time)

You need to massively oversample the camera frame rate. Use at least 480fps camera or 1000fps camera to film a 120Hz strobe backlight more reliably. Camera frame rate need to be 4x to 8x the display refresh rate to avoid camera-only synthetic rolling bars that is generated by the beat-frequency (like music harmonics) effect between slightly different display Hz versus camera frame rate.

I've been doing this for years, including my very old year 2012 LightBoost video at www.blurbusters.com/lightboost/video/

Try a different camera found at the bottom of www.blurbusters.com/scanout and make sure camera frame rate is much higher than display refresh rate.

You don't see it with your eyes. If camera problems are not important to you, don't worry about XG270. Bar is a camera frame rate behavior, since the camera is not synchronizing to the display. Camera fault / artifact from camera operation.
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