A magneto-optic recording medium has a stacked structure composed of a memory layer, a domain wall displacement layer having domain wall-resistant magnetism smaller than the memory layer, and a switching layer having a lower Curie temperature than these layers interposed between these layers. The action of expanding blades, which rotate radially outwardly and backwardly to deploy from the sides of the arrowhead upon impact, separates the tip of the arrow containing the signal generator and transmitter in a sideways manner from the rest of the arrowhead. Finally, the canceler equalization is adapted to either the anticipated or the actual crosscoherence among the input channels, producing a natural equalization regardless of the input. While a user moves the handheld device, inertial information corresponding to the movement is accumulated on the handheld device. Such a screen, when combined with matched polarization analyzing eyewear, provides extremely low cross-talk from any observation point.