January 16, 2007


Advantages of an LCD monitor

Brightness: An LCD can be made brighter by increasing the brightness of the backlight. In the case of a CRT, an increasing brightness also increases the beam spot size; this lowers the effective resolution, yielding a fuzzy image.

Flicker less: An LCD display dose not flicker. In a CRT, an electron beams scan the phosphor screen horizontal lines from top to bottom and this illuminates the screen. This must be done fast enough for the eye to not notice a flicker, which is not always achievable. The LCD has a constant source of light over the whole screen which means that once a pixel is on, it stays on until turned off, and vice versa.

Crisp and Sharp image: For a CRT screen, the electron beam is circular when aimed directly forward, but it becomes elliptical when aimed at any other direction. This may cause image clarity or focus issues at the screen edge. An LCD has millions of pixel hard etched on to the panel, each effectively independent from its neighbor. With normal scanning, electron beam distortion is not an issue. There for the image always appears crisp over the entire screen.

Perfect Geometry: LCD monitor provide geometrically perfect and distortion free images, which is a huge advantages for graphics artists and designers.

Longer life: The life of an LCD depends on the life of the backlight, which is composed of one or more tiny fluorescent tubes. The typical life of a back light is stated to be around 50000 hours to the half brightness point; which is the point at which brightness is one-half the original brightness. This is the industry standard measure for product life.

In case of a CRT, the age depends on the formation of oxide layer on the cathode of the electron gun, which decreases beam current. Also, the phosphor ages and become less efficient over a period. The typical CRT half brightness point has been found to be between 10000 and 20000 hours.

Power consumption: The power required to run an LCD is about one-half to one- third of that required for a CRT with the same screen area. In addition to this, LCD generates considerable less heat than CRT monitors because of the technology difference. This indirectly leads to a lower load on air conditioning, thus reducing running coast. Similarly, the lower power requirements of an LCD monitor make it easier to be used with an UPS, because the lower power required provides precise extra minutes to save important data and shutdown the PC.

Low emission: A CRT monitor can generate electric, magnetic and even x-ray emission due to the high- voltage power supply (13000v-25000v for final anode) necessary to drive the CRT and the electron beam striking the phosphor screen. An LCD has no such issues because the different technology.

Better ergonomics: LCD monitors are smaller, more compact and lighter when compared to CRTs. Thus they take-up less space.

Total coast of ownership: The prices of LCD monitors have been decreasing in resent years. When calculated, one can imagine the power saving features of LCDs reducing the total coast of ownership over a period of few years.

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