CRT
Cathode ray tube (CRT) was commonly used to display image on a television set, computer displays, radars and wave forms osciloscope. It is composed of a vacum tube wit th eff. basic components
- Three Electron guns (for red, green, and blue phosphor dots)
- Electron beams
- Focusing coils
- Deflection coils
- Anode connection
- Mask for separating beams for red, green, and blue part of displayed image
- Phosphor layer with red, green, and blue zones
- Close-up of the phosphor-coated inner side of the screen
The first cathode ray tube to use a hot cathode was developed by John B. Johnson (who gave his name to the term Johnson noise) and Harry Weiner Weinhart of Western Electric, and became a commercial product in 1922.
The earliest version of the CRT was invented by the German physicist Ferdinand Braun in 1897 and is also known as the Braun tube. It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen. and In 1907, Russian scientist Boris Rosing used a CRT in the receiving end of an experimental video signal to form a picture. He managed to display simple geometric shapes onto the screen, which marked the first time that CRT technology was used for what is now known as television.
The CRT uses an evacuated glass envelope which is large, deep, heavy, and relatively fragile. this kind of technology was once very usefull but now a history, since new technolgy comes like plasma and LCD display.
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