Asus VG27BQ (ULMB SYNC) double image

Ask about motion blur reduction in gaming monitors. Includes ULMB (Ultra Low Motion Blur), NVIDIA LightBoost, ASUS ELMB, BenQ/Zowie DyAc, Turbo240, ToastyX Strobelight, etc.
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BotDamian
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Joined: 25 Aug 2020, 14:07

Asus VG27BQ (ULMB SYNC) double image

Post by BotDamian » 25 Aug 2020, 14:21

Hello,
I'm trying different settings on my VG27BQ that has just arrived today and I very like it and it's great, it has no ghosting :shock: maybe like 1px but very dim.

When I enable Gsync (Adaptive-Sync) i see no difference at all.
When enabling ELMB SYNC (Gsync + Strobe at once) i see double image, so I see two ufos.
It's sharper than withoug ELMB SYNC but the alien has now 3 eyes, without ELMB SYNC it was little blury but no ghosting or similar.

Is there a way to manualy adjust the strobe?

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Chief Blur Buster
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Re: Asus VG27BQ (ULMB SYNC) double image

Post by Chief Blur Buster » 25 Aug 2020, 16:59

BotDamian wrote:
25 Aug 2020, 14:21
Is there a way to manualy adjust the strobe?
It's a bit difficult as there is not much tuning facility, but:
- Try refresh rate headroom (best for fixed-Hz ELMB), and using framerate=Hz
- Try various framerate caps and make sure framerate stays at the cap (doesn't fluctuate)
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AddictFPS
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Re: Asus VG27BQ (ULMB SYNC) double image

Post by AddictFPS » 26 Aug 2020, 15:48

BotDamian wrote:
25 Aug 2020, 14:21
Is there a way to manualy adjust the strobe?
https://www.aperturegrille.com/reviews/ASUSVG27AQ/#ELMB

Sadly not, like VG27AQ, ELMB-Sync apply multi strobe flashes at each refresh. Single strobe its the only way to not have this issue. Disable it, is a eye strain machine, unbearable. Non strobed, or only ELMB. But i read at launch time complains about high crosstalk, but maybe is now better tuned if ASUS updated firmware ?

I think only impulse displays (CRT, SED, FED) can do VRR motion blur free perfectly Sync, because light and color are the same layer, and motion blur "almost free" is native for this impulse technology, so none issue except the same of a CRT with fixed frequency. Brightness a bit dimmed, and flicker more noticeable, if frecuency down to much. Less beam shots, phosphor decay cause brightness loss and flicker, but above certain frequency level ~85, depending of phosphor used, no brightness or flickers change at all.

Perfect Sync Strobing/BFI + VRR seems to me not possible, but well tuned, barely seen imprecisions, can get good results. Is a challege but can be done. Strobing/BFI algoritm can't know how long the current frametime will it be, framerate can't be predicted, so it's a chain of small imprecisions, allways there are one frame of strobe/BFI imprecision when framerate is changing continuously. So we need assume this limit.

But current doubled images... nobody can't assume it.

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