ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,898, issued on Sept. 16, was assigned to Carl Zeiss Jena GmbH (Jena, Germany).
"Holographic operating element" was invented by Christoph Erler (Jena, Germany), Petr Vojtisek (Jena, Germany) and Siemen Kuehl (Jena, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lightguide structure for illumination, detection and/or holographic representation includes at least one planar lightguide for guiding electromagnetic radiation of at least a first spectrum, at least one illumination arrangement located on the first side face of the lightguide, and at least one holographic outcoupling structure for coupling out electromagnetic radiation guided in th...