Apparatus for optical see-through head mounted dispaly with mutual occlusion and opaqueness control capability

Compact in the present invention can be modulated with the opacity of a perspective image path virtual image is covered by a portion of a perspective image can also be combined, a perspective image path so that also the above perspective view, to cover a portion of the virtual view and the virtual image path and a mounted display (compact optical see-through head-mounted display) - the optical sight head.