Readouts on digital watches & calculators use this 3-letter technology invented by James Fergason
... By the end of the decade, most of the world's digital watches used this 
kind of... [DOC] [TLE] James Fergason | Lemelson-MIT Program [PAR] James Fergason holds over 125 U.S. patents in liquid crystal technology, 
including the first practical use of liquid crystals.