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ULMB 120hz question -- ULMB Pulse Width

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.

ULMB 120hz question -- ULMB Pulse Width

Postby mds83 » 14 Mar 2018, 11:26

Does the "pulse width" make much of a difference? I play games in pitch dark room with window completely covered with no sunlight bleeding. So I am able to go all the way down to around 25 or so without it affecting brightness too much.
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ULMB 120hz question -- ULMB Pulse Width

Postby Chief Blur Buster » 14 Mar 2018, 11:49

Pulse Width has a subtle effect on improving motion blur.

1. TestUFO Panning Map Test, 1440pps and faster
2. TestUFO Ghosting Deluxe Test, 1440pps and faster

During 100% ULMB Pulse Width, it gets hard to read the tiny text. But if you decrease your ULMB Pulse Width, you can read the tiny text (street name labels!) at the full motion speeds (1440pps and 1920pps).

The relevant old BlurBusters article is LightBoost 10% vs 50% vs 100% but this is the modern ULMB way of doing things -- adjusting pulse width adjusts the amount of motion clarity you want in a brightness-versus-clarity tradeoff.

If your screen is extremely bright, then the use of ULMB Pulse Width can be your alternative brightness adjustment that actually has a benefit (clearer motion) for darkening your screen.

That said, the effect is much more noticeable during VSYNC ON. The triple match (framerate = refreshrate = stroberate) creates the best possible ULMB motion. This does require really smooth gaming mice on really good mousepad (where mouse turning is exactly as smooth as keyboard strafe left/right). Even mere mouse microstutters can easily hide the ULMB Pulse Width differences, but if you play your games with very smooth motion, the adjustable persistence makes a noticeable difference.

It depends on the game, and your gaming habits, how important this is. It's very subtle, so some competitive players may prefer ultrahigh framerates, maximum brightness (ULMB Pulse Width 100%, Brightness 100%) as well as VSYNC OFF operation, or even disabling ULMB altogether to have less input lag -- depending on the gaming tactic. See HOWTO: Using ULMB Beautifully and Competitively to decide the right tool for the right job (including using ULMB).

That said, if maximal motion clarity is your numero uno goal (in cases where it's more important than minimum possible absolute lag) -- then ULMB + ULMB Pulse Width + VSYNC ON + powerful GPU (or slightly lowering Hz to make it easier to match fps=Hz), this combo becomes your friend in matching or beating CRT-era motion clarity.
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