Computer displays are more commonly known as monitors (and technically, as VDUs) and are one of the most important computer hardware. Monitors display the output received from computers, but don't produce a permanent record.
Most people use a type of monitor called CRT (cathode ray tube). These are the ones with the really big backs, and are generally heavier (they resemble the TV you have, i.e. if you're using an old one). The main advantage of the CRT monitor is that it has a very high contrast ratio, even more than that in modern LCDs. It also has a very high speed response, no input lag and uses reliable and proven display technology.
However, the fact that it's really heavy puts off a lot of people from buying these monitors. Moreover, it really takes a toll on your electricity bill due to its high power usage.
Nowadays, more people are turning to LCD (Liquid Crystal Display) monitors. As you may have already seen one yourself, you will agree that it is comparatively light in weight and much less bulkier than a CRT monitor. Also, the fact that it doesn't consume a lot of power means that people are more inclined towards buying them.
However, the relative expensiveness of LCD monitors have on the other hand stopped a lot of people from buying them. Moreover, LCDs allow a very limited viewing angle. This basically means that, when you look at the LCD from a particular angle, the color, saturation and contrast tend to change, even when you change your posture while sitting in front of your computer. LCDs also tend to have a low contrast ratio when compared to CRT monitors.
Plasma monitors are less popular due to the really expensive price, but is generally recommended if you really like to watch your movies in high definition. It has a higher contrast ratio than LCDs (but less than CRTs), and is quite light and compact. However, plasma monitors tend to heat up quite quickly, and thereby use up a lot of electricity.
Don't be too overwhelmed by what you just read. In a nutshell, I'd recommend CRT if you're just going to use your computer for only checking your mail, doing office work and surfing the net; LCD if you're concerned about your electricity bill and if you like to have a lightweight monitor; and a plasma monitor if you're really into watching high - quality movies (I don't mean the story, the quality of the picture!)
Summery: This article describes the various computer displays or monitors available in the market today, with a brief comparison of these various types, while highlighting their advantages and disadvantages.
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