It's sort of obvious if you've seen the Panasonic implementation like in CF-RZ line, it's the same setup. The top and bottom halves are connected through a pair of square pieces long as the laptop's thickness. Hinges each articulate 180 degrees to total 360 degrees to allow it to fold like a human knee joint.

The four hinges must stay synchronized under lift force from the user, but I haven't seen that being a problem on a Let's note, so it's probably good.