ALEXANDRIA, Va., June 18 -- United States Patent no. 12,326,573, issued on June 10, was assigned to NATIONAL YANG MING CHIAO TUNG UNIVERSITY (Hsinchu, Taiwan).

"Optical system including pancake lens assembly" was invented by Yu-Jen Wang (Taipei, Taiwan) and Yi-Hsin Lin (Zhubei, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes a pancake lens assembly which has a lens unit and a liquid crystal device. The lens unit includes a partially reflective mirror, a reflective polarizer, and a quarter waveplate disposed between the partially reflective mirror and the reflective polarizer. The liquid crystal device is disposed between the quarter waveplate and the reflective polarizer. Whe...