Nick (Nicholas) Holonyak is credited as the designer of a light emitting diode that produces visible light instead of an infrared one. Holonyak, the son of Ukrainian immigrants Transcarpathian region, was an employee at General Electrics Company during this period. Semiconductor lasers used as controlled sources of light in phiberoptics communication lines, CD- and DVDplayers, HD-DVD and Blu-Ray devices, cellular phones as well as in printers and during surgeries and spectroscopity. One of the most common areas of use is scanning of product identification numbers. In total, Nick Holovnyak owns 41 patens in the field of electronic engineering.