The Scotman John Logie Baird displayed television publicly for the first time in London, 1926, using mechanical television system, the Nipkow disc, patented in 1883. By 1927, Philo T. Farnsworth transmitted the first television image using cathode ray tube (invented in 1897).
In electronics, the following 20 years were dominated by vacuum tubes. Chemistry significantly contributed to the development of electrodes and the control units of cathode-ray tubes.
The next twenty years was the era of the vacuum tube in electronics, and chemistry contributed the unique materials for electrodes and control elements within the tube. By the 1950s, many innovations were made, including the integrated circuit in 1958.
Cathode ray tube shows the electron beam across a phosphor being bent by a magnet.