Today, just about all monitors and screens are digital (typically using an LCD or Plasma technology), but a decade or two ago, computer displays were based on the analog technology inherited from TV sets.
These analog displays were constructed around Cathode Rays Tubes (commonly referred to as CRTs).
Analog TV has a fascinating history from when broadcasts were first started (in Black and White), through to the adoption of color TV (using a totally backwards-compatible system with the earlier monochrome standard), through to cable, and now digital.
Analog TV transmissions and their display technology really were clever inventions (and the addition of colour is another inspiring innovation). It’s worth taking a look about how these devices work, and how they were designed, using the technology of the day.
After a couple of false starts, an analog colour TV system, that was backwards compatible with black and white, became standard in 1953, and remained unchanged until the take-over by digital TV broadcasts in the early 2000’s.