Evolution of Television

  • CRT

    The Cathode Ray Tube (CRT) was made. It improved electronic signals to get to people's houses faster.There was still a problem in developing a device to transmit changing images due to the slow reaction of selenium to light.
  • The Photoelectric cell

    The Photoelectric cell
    The photoelectric cell was introduced as a replacement for selenium. This overcame the problem with slow rection with slenium and light.
  • First attempt

    First attempt
    The first attempts at commercial television occurred in the U.S. and in England.
  • Second attempt

    Second attempt
    There were about 15 American television stations. The pictures attempted for broadcast were mostly experimental. Disappeared in 1933 because of poor picture quality.
  • Realization

    Despite decades of effort, there was a limit to how rapidly a mechanical scanner could work. The television in 1930 was fuzzy and the picture jumped. It was estimated that 7 million pictures per second would have to be transmitted for good quality.
  • The RCA

    RCA announced a 1 million-dollar plan to develop television. Having the television ready to market was in an electronic company's best interest because radio sales were slowing down.
  • Stadards

    The Federal Communications Commission settled on the 525 line screen, 30 frames per second, and 6 megahertz band width standard.
  • Success

    Half of American households had a television set and thus marked a piece of technological history.
  • Satellite

    Early Bird, the first international communications satellite, is launched (Intelsat I).
    The fall season opens with almost all of NBC's prime time schedule produced on color film.
  • Digital tv

    Digital tv
    All analog services were switched off and digital televeision came to the U.S