Head-mounted display eyeball tracker integrated system

Abstract

Head-mounted display with an eye-tracking system and including a light-transmitting substrate ( 20 ) having two major surfaces and edges, optical means for coupling light into said substrate ( 20 ) by total internal reflection, partially-reflecting surfaces ( 22 a - 22 c ) carried by the substrate ( 20 ) that are not parallel with the major surfaces of the substrate ( 20 ), a near-infrared light source ( 78 ) and a display source ( 92 ) projecting within the photopic spectrum, wherein light from the light source ( 78 ) and light from the display source ( 92 ) are coupled into the substrate ( 20 ) by total internal reflection.

What is claimed is: 
     
         1 . An optical system, comprising:
 a light-transmitting substrate having at least two major surfaces and edges; at least one optical means for coupling light waves into the substrate by total internal reflection;   at least two partially reflecting surfaces carried by the substrate wherein the partially reflecting surfaces are not parallel to the main surfaces of the substrate;   at least one light source projecting light waves located within a first optical spectrum, and;   at least one display source projecting light waves located within a second optical spectrum,   
       characterized in that the light waves from the light source and light waves from the display source are coupled into the substrate by total internal reflection. 
     
     
         2 . The optical system according to  claim 1 , wherein the first optical spectrum is different than the second optical spectrum. 
     
     
         3 . The optical system according to  claim 1 , wherein the light waves coupled inside the substrate are light waves of a first angular spectrum and a second angular spectrum, and wherein angles located within the first angular spectrum are smaller than angles located within the second angular spectrum. 
     
     
         4 . The optical system according to  claim 3 , wherein a first partially reflecting surface is partially reflective for light waves located within the first optical spectrum and within the first angular spectrum, and substantially transparent for light waves located within the second optical spectrum and within the first and second angular spectrum. 
     
     
         5 . The optical system according to  claim 3 , wherein a second partially reflecting surface is partially reflective for light waves located within the second optical spectrum and within the first angular spectrum, and substantially transparent for light waves located within the first optical spectrum and within the first and second angular spectrum and for light waves located within the second optical spectrum and within said second optical spectrum.