HEAD-MOUNTED DISPLAY EYEBALL TRACKER INTEGRATED SYSTEM
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.
1 . A see-through optical system for vehicle safety, comprising:
a transparent substrate having at least two major surfaces and edges;
an image projector configured to project an image made up of light waves of at least a second optical spectrum, said image projector being optically coupled to the substrate so as to inject the image into the substrate so that the image propagates within the substrate by internal reflection at the two major surfaces;
an array of partially-reflective surfaces carried by said substrate and obliquely angled relative to said major surfaces, said array of partially-reflective surfaces coupling out the image from the substrate so as to be viewable by the eye of a viewer;
an illumination source generating illumination light waves within a first optical spectrum distinct from said second optical spectrum;
a chromatically-selective reflector carried by the substrate and configured for coupling-in light waves generated by said illumination source reflected from the eye of the viewer;
a detector arrangement deployed to derive an image of at least part of the eye of the viewer from said light waves reflected from the eye of the viewer; and
a processing system associated with said detector arrangement and configured to process said image of at least part of the eye of the viewer to detect an open/closed state of the eye and to derive an indication of driver drowsiness.