Essentially it just flashes the frame briefly then switches the display to black. This helps with the tiny motions your head and eyes make between refreshes which normally cause your brain to not respond well because your movement isn't matching what you are seeing.
They also implemented something called Time Warping which is very complicated but it's basically a depth-aware frame interpolation that let's the device create way more frames than actually are which helps again with keeping your brain from freaking out about the discongruity of your head motion and your vision.
You can watch an explanation of how it works here: https://youtu.be/HoLHHUdi_LE?t=5m41s
Essentially it just flashes the frame briefly then switches the display to black. This helps with the tiny motions your head and eyes make between refreshes which normally cause your brain to not respond well because your movement isn't matching what you are seeing.
They also implemented something called Time Warping which is very complicated but it's basically a depth-aware frame interpolation that let's the device create way more frames than actually are which helps again with keeping your brain from freaking out about the discongruity of your head motion and your vision.
This video explains how that works: https://www.youtube.com/watch?v=WvtEXMlQQtI