Get COLOUR TELEVISION INSTRUCTIONS

In color television, the image is reproduced by selective excitation of three RE-phosphors (blue, green, and red) deposited on the internal face of the screen by a highly powerful electron beam originating from a metal electrode (cathode). Such an excitation technique is termed Cathode Ray Tube (CRT) technology.

Colour television was first demonstrated publicly by John Logie Baird on 3 July 1928 in his laboratory at 133 Long Acre in London. The technology used was electro-mechanical, using a spinning mirror-drum and revolving disc that alternated blue-green and red filters. An early test subject was a basket of strawberries.

At the 1939 World's Fair, RCA laboratories–now a part of SRI International–introduced the all-electronic television system. The invention of the television created an industry that forever changed the world. By 1953, RCA devised the first complete electronic color TV system.

[Color TV] adds a new dimension to the entertainment arts, adds realism to journalism, and intensifies television as a social and educational medium” — General David Sarnoff, Chairman of RCA Laboratories, on the release of RCA's color television system in 1953.

Red, green and blue are known as the primary colors, and the colors made by the addition of the primary colors are called secondary colors. Therefore, Red, Green, and Blue (RGB) are the three main colors that form a colored picture in a color tv.