The monitor or computer screen

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Introduction to computer screens:

We call screen (or monitor) display device of the computer. There are usually two families of monitors:

* The CRT (CRT noted for Cathode Ray Tube), powering the majority of desktop computers. These monitors large and heavy, with a high power consumption.

* Flat screens fitted to all laptops, personal digital assistants (PDAs), digital cameras, as well as more and more desktops. These screens are compact in depth (hence the name), lightweight and with low power consumption.

Specifications:

Monitors are often characterized by the following:

* Definition: the number of dots (pixels) screen that can display this number of points is generally between 640x480 (640 points in length, 480 pixels wide) and 2048x1536, but higher resolutions are technically possible. The table below provides the definitions recommended by the size of the diagonal:

diagonal definition

15 " 800x600

17 " 1024x768

19 " 1280x1024

21 " 1600x1200

* Size: It is calculated by measuring the diagonal of the screen and is expressed in inches (one inch equals 2.54 cm). Care must be taken not to confuse the definition of the screen and size. Indeed a screen of a given size can display different definitions, however in general the large screens have a better definition. Standard sizes of the screens are the following (partial list):

o 14 inches, a diagonal of 36 cm;

o 15 inches, a diagonal of 38 cm;

o 17 inches, a diagonal of 43 cm;

o 19 inches, a diagonal of 48 cm;

o 21 inches. a diagonal of 53 cm;

* The dot pitch (dot pitch in English): This is the distance between two phosphors, the more it is little more the image is accurate. And a dot pitch less than or equal to 0.25 mm will provide a good user experience, while the screens having no mask at or above 0.28 mm are avoided.

* Resolution: This determines the number of pixels per unit area (pixels per linear inch (English DPI: Dots Per Inch, translate dots per inch). A resolution of 300 dpi means 300 columns and 300 rows of pixels in an inch square which would then 90,000 pixels on a square inch. The reference resolution of 72 dpi gives us a pixel 1 "/ 72 (one inch divided by 72) is 0.353mm, corresponding to a pica (a typographical unit Anglo-Saxon ).

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