BFI can benefit non-LightBoost 120Hz monitors, and overclocked 120Hz monitors.
However, it will only provide 50% motion blur reduction.
To understand the motion blur mathematics of BFI better:
---60fps+BFI on non-LightBoost 120HzBFI Sequence
: 8.3ms refresh + 8.3ms black frameLength of Visible Frame:
8.3ms:16.7ms = 50% motion blur elimination
As you can see, a 120Hz refresh is 8.3ms, while a 60Hz refresh is 16.7ms
---60fps+BFI on LightBoost 120HzBFI Sequence
: 1.4ms visible refresh + 6.9ms backlight off + 1.4ms black frame + 6.9ms backlight offLength of Visible Frame:
1.4ms:16.7ms = 92% motion blur elimination
A 120Hz LightBoost refresh at LB=10% is a 1.4ms strobe (visible refresh) followed by 6.9ms of darkness (backlight off). LightBoost can only strobe at 120Hz, and can't be made to strobe at only 60Hz. So the BFI trick is the equivalent of blocking every other strobe, to simulate 60Hz LightBoost via software means.
For those who do not understand fully, sample-and-hold motion blur is directly proportional to the length of visible refresh. Motion blur is reduced by shortening the refreshes. There are only two ways to do this efficiently. Either by increasing Hz -- or by adding black periods between refreshes. LightBoost does that. BFI also does that. We're just simply combining BFI+LightBoost to achieve "60Hz LightBoost" by blacking-out every other strobe with a black frame.
For those who are not familiar with sample-and-hold motion blur (the motion blur caused by eye-tracking), then see www.testufo.com/#test=eyetracking
within a supported web browser (e.g. Google Chrome). This motion demonstration looks very different on CRT than it does on regular LCD's.
Now, driver makers will not be doing this as BFI has numerous disadvantages. It can cause extra flicker, it can worsen colors, it can amplify LCD inversion artifacts, and it can cause LCD image retention on certain panels (flicker can interfere with LCD inversion's job of preventing burn-in). Not all monitors are prone to this. The best hope for software-based BFI is either a driver hack, or via a 3rd party utility.Edited by mdrejhon - 7/27/13 at 10:05pm