Image displaying apparatus

Claim 1

A head mounted display comprising: a display device for modulating light incident thereon in accordance with image information and reflecting the light; illuminating means for emitting light; and an optical system for guiding a beam of the light from said illuminating means into said display device and guiding a beam of reflected light from said display device to the pupil of an observer located at a position different from that of said illuminating means, wherein said optical system has a polarization beam splitter, only illuminating light of P-polarized light from said illuminating means is transmitted through said polarization beam splitter to illuminate said display device with the illuminating light, only image display light of S-polarized light modulatingly reflected by said display device is incident on said polarization beam splitter as a second incidence thereon and reflected by said polarization beam splitter to be incident on a concave mirror or a concave half mirror disposed at a position opposing to a direction of the pupil of said observer with respect to said polarization beam splitter by way of a quarter wave plate, and light reflected by said concave mirror or said concave half mirror is again transmitted through said quarter wave plate and incident on said polarization beam splitter as a third incidence thereon and transmitted through said polarization beam splitter to be guided to the direction of the pupil of said observer.