Patent ID: 6023253
Filing Date: 2000-02-08
Classification: G02B

Abstract:
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; andan 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, andlight 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.