A display apparatus for displaying a visual image to retina directly is comprised of an eye lens, a transparent display panel on which a picture image is displayed, a point source of light, and a mirror for reflecting a light which is emitted from the point source of light through the display panel to...http://www.google.fr/patents/US5371556?utm_source=gb-gplus-shareBrevet US5371556 - Spectacle type retina direct display apparatus
