Patent ID: 7036937

Claim:
An illuminating device reusing polarized light to illuminate a display panel, comprising: a light source, located at one focal point of an elliptical mirror; a cylindrical optical channel tube, having an incident end and an emerging end, another focal point of said elliptic mirror being located at said incident end, said incident end receiving beams of light from said light source and emerging a well-distributed beam of light from said emerging end to form an array of virtual optical images at said incident end; a front lens, located outside of said emerging end of said cylindrical optical channel tube to form an array of real optical images by projecting said array of virtual optical images; a polarized light converter, located at a side of said front lens to receive said array of real optical images and transforms said array of real optical images into a plurality of particular polarized light a rear lens, located between said polarized light converter and said display panel to overlap said particular polarized light onto said display panel.