VRR BFI LFC driver hack idea

Ask about motion blur reduction in gaming monitors. Includes ULMB (Ultra Low Motion Blur), NVIDIA LightBoost, ASUS ELMB, BenQ/Zowie DyAc, ToastyX, black frame insertion (BFI), and now framerate-based motion blur reduction (framegen / LSS / etc).
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ScepticMatt
Posts: 38
Joined: 16 Feb 2014, 14:42

VRR BFI LFC driver hack idea

Post by ScepticMatt » 18 Jun 2025, 12:22

Hi everyone.

Has anyone implemented or thought of using driver side LFC to enable VRR BFI on high refresh rate monitors?

I know that some OLED monitor have BFI modes, but they typically disable VRR as far as I'm aware

Example:
480 Hz VRR OLED monitor
Frame rate 100-200 Hz
LFC 2x forced on, every second LFC frame replaced by black (effective refresh rate 200-400 Hz)

Disadvantages:
Brightened halved
HDR EOTF undertracking

Recommended hardware would be
100 fps+ source (flicker fusion)
400 hz+ display (would still make it possible to use LFC while using LFC 2x for BFI)
250 nits full screen brightness display
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