In the beginning people were useing CRT Monitors that at that time comes with Black&white ,Green or amber display.Then Color Monitors,EGA Color Monitor,and the VGA Clor Monitors came.Then LCDs were being introduced.One may ask why should he buy a LCD not the CRT Monitor where CRTs are cheap as compared with LCDs .Well we have the answer for this ,one may buy LCDs because,
Brightness
The LCD monitor has a better brightness ,since an LCD acts like a shutter, it can be made brighter by increasing the brightness of the backlight. However, when the beam current of a CRT is increased to boost brightness, the beam spot size also increases, which lowers effective resolution and may yield a soft or fuzzy image.No flickerThere is no flicker on an LCD display because, while a CRT must be refreshed, the LCD has a constant source of light over the whole screen. Once a pixel is on, it stays on until turned off.
Focus
In contrast, an LCD has millions of pixels, each one effectively independent from its neighbor, with no scanning electron beam, so distortion problems are negligible. The image is always perfectly "focused" over the entire screen.
Power consumption
LCD consumes less power as compared with CRTs that is about one-third of that required for a CRT with the same screen area. In addition, the amount of heat generated by an LCD monitor is considerably less than a CRT monitor. And, if an LCD monitor is used with an uninterruptible power supply, the lower power required provides precious extra minutes to store critical data and shut down gracefully in the event of a power failure.These power-saving features of LCDs reduce the total cost of ownership.
Low emissions
An LCD is essentially emission-free, while a CRT monitor can generate electric, magnetic and even X-ray emissions due to the high-voltage power supply necessary to drive the CRT. An LCD causes no electromagnetic interference.
Brightness
The LCD monitor has a better brightness ,since an LCD acts like a shutter, it can be made brighter by increasing the brightness of the backlight. However, when the beam current of a CRT is increased to boost brightness, the beam spot size also increases, which lowers effective resolution and may yield a soft or fuzzy image.No flickerThere is no flicker on an LCD display because, while a CRT must be refreshed, the LCD has a constant source of light over the whole screen. Once a pixel is on, it stays on until turned off.
Focus
In contrast, an LCD has millions of pixels, each one effectively independent from its neighbor, with no scanning electron beam, so distortion problems are negligible. The image is always perfectly "focused" over the entire screen.
Power consumption
LCD consumes less power as compared with CRTs that is about one-third of that required for a CRT with the same screen area. In addition, the amount of heat generated by an LCD monitor is considerably less than a CRT monitor. And, if an LCD monitor is used with an uninterruptible power supply, the lower power required provides precious extra minutes to store critical data and shut down gracefully in the event of a power failure.These power-saving features of LCDs reduce the total cost of ownership.
Low emissions
An LCD is essentially emission-free, while a CRT monitor can generate electric, magnetic and even X-ray emissions due to the high-voltage power supply necessary to drive the CRT. An LCD causes no electromagnetic interference.
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