The shutters are unnecessary. During a cross-country trip in 1979, the subject of 3D TV was raised. I described how this could be accomplished to John and Lynda Danner and Beth Field, who were riding in the VW Bus with me. All that's needed is a pair of pixel clusters where conventional TV uses one cluster. The pair are covered by polarizing filters so that polarizing glasses just like the ones in theaters can be used. The picture needs to be brighter, because the filters cause light loss, but the technology was there in 1979 and still is.