ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,498,668, issued on Dec. 16, was assigned to Envisics Ltd. (Milton Keynes, Great Britain).
"Light shuttering for waveguide pupil expansion" was invented by Timothy Smeeton (Milton Keynes, Great Britain) and Edward Boardman (Milton Keynes, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A light shuttering device comprises a plurality of liquid crystal cells, wherein each liquid crystal cell is operable in a first optical state or a second optical state in response to a respective first or second drive signal. A drive circuit comprises a plurality of switches and a drive controller. Each switch is arranged to output the respective first or sec...