Readouts on digital watches & calculators use this 3-letter technology invented by James Fergason
... of the first liquid-crystal 
displays in pocket calculators, digital wristwatches, clocks and ... Several other 
scientists, including James Fergason, who worked at Westinghouse ... Before 
LCD became prevalent, screen displays were made using cathode ray... [DOC] [TLE] The history of liquid-crystal displays - Proceedings of the IEEE [PAR] plays for digital watches, pocket calculators, and small handheld devices.