Computer Monitors

CRT (cathrode ray tube) and LCD (liquid crystal display)

Whats the difference between CRT and LCD?

CRT monitors are mostly found in televisions and computer monitors. They work by moving an electron beam back and forth across the back of the screen. Every time the beam passes the screen, it lights up Phosphor dots on the inside of the glass tube, which makes it like up the active parts of the screen. CRT monitors have been used for 100 years. By drawing lines to the top and bottom of the screen it creates an entire image on the screen.

LCD monitors can be found in watches and computer monitors. they use 2 sheets of polarizing material with a liquid crystal solution between them. An electric current runs through the liquid causing the crystals to align so that the light cannot pass through them. this makes each crystal like a shutter either allowing light to pass through or not. For colour they use two different types of technology but it is very expensive.