ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,940, issued on Oct. 21, was assigned to Apple Inc. (Cupertino, Calif.).
"Photo-sensing enabled display for stylus detection" was invented by Mohammad Yeke Yazdandoost (San Francisco) and Christopher J. Butler (San Jose, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical stylus system including an optical stylus and optical sensing system that are together operative to determine one or more of the target or touch location, centroid, hover distance, tilt angle, azimuth, and in some instances the orientation and rotation of the stylus is disclosed. In some examples, light illuminator and detector angular filters are employed to limit the ...