This kind of technology gives a 3D effect using a filter that cuts out interlaced lines for your eyes. While this can be used in static images to give them animation, in screens it instead allows different images to be broacast to different points in space. Seeing as the 3DS will always have the player at a reasonably predictable distance from the screen, this could really work. The tech has to be perfect, though - otherwise you'll get ghosting -end quote
it's either this tech or the other tech which has a very similar idea
the upper screen has 800 pixels width, but each eye only sees 400 as long as your head is in the proper area each eye will see the correct image so the effect should be instant
the question is, do you tilt your head to look at the lower screen? (is it a big tilt?) or do you just look down?
--- Don't worry about it. I laugh automatically whenever I hold sharp objects. - Machi - Nagasarete Airantou