Today, it is virtually impossible to work without a computer. The majority of population has a computer at home with a CRT or LCD. CRTs (Cathode Ray Tube) tend to disappear to make way for LCD screens that have the advantages of being lighter and less bulky.
The LCD format is shown in inches (1 inch equals approximately 2.54 cm) and is calculated by measuring the screen diagonal. Several sizes are available: 15 inches (38 cm), 17 inches (43 cm), 19 inches (49 cm), 20 inches (50 cm), 23 inches (58 cm) and 30 inches (76 cm). Care must be taken not to confuse the definition of screen and size. Although large screens display a higher resolution, screen can display multiple definitions. Note that the larger the screen, the more expensive it is. The screen size choice depends on your usage: for office, a 15-inch or 17-inch enough, for graphics and image processing, a larger screen is recommended for a better user experience.
The LCD screens brightness is expressed in candela per square meter. More luminance is high, the image is bright (candela means candle in Latin). The contrast is purchase criterion just as important as the screen brightness. It is the light intensity variation of the brightest and darkest areas of image. Furthermore, this variation is, the better the color rendering.
As mentioned above, the screen size is not the same as resolution or definition. The definition is the number of dots (pixels) that the screen can display. This number of points is generally between 640 x 480 (length x width) and 1600 x 1200. However higher definitions are technically possible. The resolution, in turn, determines the number of pixels per area unit (pixels x linear inch), DPI (dots per inch). A resolution of 300 DPI means 300 columns and 300 rows of pixels per square inch, which therefore gives 90,000 pixels per square inch. The image is composed of pixels which are given in seconds. This is called synchronization. Synchronization speed is measured in Hertz, horizontally and vertically. The higher this value is, the better the viewing experience, you can not see the image flicker. It must therefore be greater than 67 Hz (bottom limit from which the eye actually sees the image flashing). Most people no longer perceive flicker from 70 Hz and greater than or equal to 80 Hz is ideal.
A display that does not consume much energy is recognizable by its Energy Star label. It shows that a screen has a processor automatic standby, that when nothing happens, saves energy.
Some LCD screens include features called multimedia, that is to say, they offer besides the integrated speakers or a USB hub to connect multiple devices.
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