US Patent Issued to SEIKO EPSON on Jan. 13 for "Virtual image display apparatus" (Japanese Inventor)

ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,874, issued on Jan. 13, was assigned to SEIKO EPSON Corp. (Tokyo).

"Virtual image display apparatus" was invented by Osamu Yokoyama (Shiojiri, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "In a virtual image display apparatus, as viewed from an exit pupil, a first emission diffraction grating and a second emission diffraction grating overlap, and a region, of the first emission diffraction grating, emitting first image light is different from a region, of the second emission diffraction grating, emitting second image light. As a result, an optical path from the first display element to the first emission diffraction grating can be prevented f...