A computer monitor, technically termed as a visual display unit, can be plainly described as an electronic device that transmits information from the computer onto a screen, thereby acting as an interface and connecting the viewer with the computer.
At present, computer monitors are available in a variety of shapes, designs, and colors.
However, based on the technology used to make computer monitors.
They can be categorized into three types:
These monitors employ the CRT technology used most commonly in the manufacturing of television screens.
In this, a stream of intense high energy electrons is used to form images on a fluorescent screen.
A cathode ray tube is a basically a vacuum tube containing an electron gun at one end and a fluorescent screen at another end.
From this electron gun, a process called thermionic emission generates a strong beam of electrons.
These electrons travel through a narrow path within the tube with high speed using various electro-magnetic devices and finally strike the phosphor points present on the fluorescent screen, thus creating an image.
Advantages of CRT Monitors:-
i) These monitors are highly reliable and efficient, and are capable of generating a resolution of up to 2048 x 1536 pixels, thereby providing a clear picture quality.
ii) Also, CRT monitors that are now available are capable of producing thousands of different colors.
iii) Secondly, CRT monitors are affordable and cost effective.
iv) Unlike conventional CRT monitors, modern technological advancements have resulted in the development of flat screen.
v) CRT monitors that reduce the glare and are good for the eyes.
Liquid crystal display, also known as liquid crystal diode, is one of the most advanced technologies available at present. Typically, an LCD monitor consists of a layer of color or monochrome pixels arranged schematically between a couple of transparent electrodes and two polarizing filters.
Optical effect is achieved by polarizing the light in varied amounts and making it pass through the liquid crystal layer. At present, there are two types of LCD technology available. These include the active matrix or TFT and a passive matrix technology.
Among these, TFT technology is more secure and reliable, and generates better picture quality.
On the other hand, passive matrix has a slow response time and is slowly becoming outdated.
Advantages of LCD Monitors:-
i) These monitors are compact, lightweight, and do not consume much desk space.
ii) Secondly, these monitors do not consume much electricity and can even be operated by using batteries.
iii) Also, the images transmitted by these monitors do not get geometrically distorted and have little flicker.
LED monitors are the latest types of monitors in the market today.
Like LCD, it is again a flat panel display making use of light-emitting diodes for back-lightning instead of Cold Cathode Fluorescent (CCFL) back-lightning used in LCDs.
Primarily, the display is of LCD only but the back-lightning is done by LED's.
LED monitors are said to use much lesser power than CRT and LCD.
Thus, they are also considered environmental friendly.
Advantages of LED Monitors:-
i) They produce images with higher contrast.
ii) They have less negative environmental impact when disposed.
iii) Lifespan and durability of LED monitors is more than CRT or LCD monitors.
iv) Because of the technology, the monitor panels can be made very thin.
v) Do not produce much heat while running.
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