Quote:Yes, it does.
Typical 60 Hz LCD or DLP with black frames disabled/interpolation disabled -- about 16.7ms of persistence (even if GtG is only 1ms or 2ms)
Typical 120Hz LCD or DLP with black frame disabled/interpolation disabled -- about 8.3 of persistence
Adding black frames to 120Hz -- about 4.1ms of persistence (for 50%:50% dark:bright duty cycle).
I'm ignoring interpolation; as that's not good for gaming.
This translates to: During 1000 pixels/second motion (1 millisecond per 1 pixel), you get a minimum 16.7 pixels of enforced display motion blur (during eye tracking) during framerate=Hz motion during video games (full frame rates) for 60fps@60Hz on a sample-and-hold 60Hz. For 120Hz, that's 8.3 pixels. For 120Hz+traditional BFI, that's 4.1 pixels of motion blurring respectively. Note, that GtG curves (finite time that a pixel takes to transition from one color to another) will generally 'add' to persistence; so these numbers are ideal case scenario, assuming continuous light output. This is observed when doing motion tests such as www.testufo.com or PixPerAn, and observing the changes in motion blur trail length (this is observed with LightBoost monitors, see Photos of motion blur: 60Hz vs 120Hz vs LightBoost.
Black frames can vary away from 50%:50% duty cycle. For example, black frame insertion could be 3:1 ratio (dark 75% of the time, bright 25% of the time). Such black frame insertion ratios would reduce motion blur by 75% instead of 50%. Likewise, a 90%:10% dark:bright duty cycle would reduce tracking motion blur by 90%. (these numbers are only exact if black frame insertion is perfectly square-wave; generally it doesn't always necessarily reach these efficiencies. However, DLP's do highly efficient black frame insertion since they turn off pixels extremely fast.).
-- Most LCD/LCoS projectors don't use black frame insertion, so they generally more motion blur than DLP's.
-- CRT's generally have approximately ~1ms of persistence from the phosphor illuminate-and-decay cycle (less for shorter persistence, more for longer-persistence). Although not a squarewave persistence, the brightest part of the illumination cycle is often at sub-millisecond levels, so that part determines the human-perceived motion clarity. That's more than 15x sharper motion clarity than a 60Hz sample-and-hold LCD, so the bar is set extremely high for displays that attempt to match CRT motion clarity.