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Electronic television was first successfully demonstrated in San Francisco on Sept. 7, 1927. The system was designed by Philo Taylor Farnsworth, a 21-year-old inventor who had lived in a house without electricity until he was 14.
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Sometime between 1946 and 1950, the research staff of RCA Laboratories invented the world's first electronic, color television system. A successful color television system based on a system designed by RCA began commercial broadcasting on December 17, 1953.
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Closed captioning and subtitling are both processes of displaying text on a television, video screen, or other visual display to provide additional or interpretive information.
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these are the ones used today.