Patent ID: 6333819
Filing Date: 2001-12-25
Classification: G02B

Abstract:
A display for head mounting comprising a light reflecting type spatial light modulator, an illumination device for illuminating the said image generator and optical means for projecting an image generated by the image generator toward an exit pupil at an eye location for viewing by an eye together with an eventual natural scene in front of the eye emplacement;wherein said optical means comprises prisms forming two beam splitters, each beam splitter formed by the intersection of two prism surfaces, a first one of said beam splitters reflecting light from said illumination device to illuminate said image generator, a spherical mirror imaging said illuminated image generator by reflecting light from said image generator traversing said first beam splitter and a second beam splitter, said second beam splitter reflecting light reflected by said spherical mirror toward said eye location; andwherein said optical means comprises a first prism, a second prism and a third prism, first and third prisms having right isosceles triangular sections in a plane perpendicular to said beam splitters, the hypotenuses thereof forming each one surface in each of said beam splitter layers, and the second prism having in the said plane a trapezium section.