US Patent Issued to RealD Spark on July 22 for "Optical stack for imaging directional backlights" (British, American Inventors)

ALEXANDRIA, Va., July 23 -- United States Patent no. 12,366,701, issued on July 22, was assigned to RealD Spark LLC (Boulder, Colo.).

"Optical stack for imaging directional backlights" was invented by Michael G. Robinson (Boulder, Colo.), Graham J. Woodgate (Henley-on-Thames, Great Britain), Jonathan Harrold (Leamington Spa, Great Britain) and Robert A. Ramsey (Boulder, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to ...