Patent ID: 7025461

Claim:
A display system, comprising: an optical panel including a plurality of optical waveguides stacked together, with first ends thereof defining an inlet face, and opposite ends thereof defining an outlet face; a projector for projecting an image light beam; a digital micromirror imaging device optically aligned between said projector and said inlet face for selectively reflecting said image light beam to said panel for forming an image on said outlet face, said imaging device including an array of mirrors each separately tiltable between opposite display and divert positions, with said display position reflecting said image light beam outbound into said inlet face toward said outlet face for display on said outlet face, and said divert position diverting said image light beam away from said inlet face; a probe element optically aligned with said imaging device for directing a probe light beam toward said mirrors in said divert positions, wherein said mirrors reflect the probe light beam outbound into said inlet face toward said outlet face; and a light sensor that senses said probe light beam traveling inbound through said waveguides toward said inlet face upon covering a spot on said outlet face.