What is monitor? Write down the working principles of CRT monitor.
|Subject||Introduction to Computer System|
|NU Year||Set: 2.(b) Marks: 1+5=6 Year: 2014|
A monitor is an
electronic visual computer display that includes a screen, circuitry and the
case in which that circuitry is enclosed. Older computer monitors made use of
cathode ray tubes (CRT), which made them large, heavy and inefficient.
Nowadays, flat-screen LCD monitors are used in devices like laptops, PDAs and
desktop computers because they are lighter and more energy efficient.
working principles of CRT monitor
A CRT monitor contains millions of tiny red, green, and blue phosphor dots that glow when struck by an electron beam that travels across the screen to create a visible image. The illustration below shows how this works inside a CRT.
The terms anode and cathode are used in electronics as synonyms for positive and negative terminals. For example, you could refer to the positive terminal of a battery as the anode and the negative terminal as the cathode.