Example image of eyePlorer eyePlorer map for 'Color television': Technology of television Television Video Bandwidth (signal processing) Radio spectrum NTSC General Electric Porta-Color PAL Cone cell Retina Rod cell Luminance Frame rate Alternating current Electrical grid 19th century 20th century Nipkow disk John Logie Baird United Kingdom Iconoscope Philo Farnsworth Vladimir K. Zworykin Kálmán Tihanyi BBC World War II United States Jan Szczepanik Selenium 1928 Commutator (electric) July 3 1938 Dominion Theatre February 4 The Crystal Palace Bell Labs Solar cell Electron gun State of the art Field-sequential color system 1940 Camden, New Jersey February 5 RCA CBS Peter Carl Goldmark August 28 Federal Communications Commission