Actually, I think motion blur comes from LCD/LED pixels not being able to turn completely off fast enough. There is that extra glow left over from turning the pixel off. The effect could be prevented almost completely (as perceived by the naked eye) with today's technology by applying power to a cell on top of the pixel, where applying power would darken the cell (thus blocking the afterglow that causes the motion blur). Kind of like the way active 3D glasses currently work.
Such a design would definitely not pass energystar/green standards!