What is a Resolution?

Resolution corresponds to the number of pixels (single bits of colour) on a computer monitor screen, expressed as the pixel value on the horizontal axis divided by the number of pixels on the vertical axis. The sharpness of a picture on a display is determined by the monitor's resolution and size. Because the same number of pixels are spread out across a larger number of inches, the same pixel resolution will be crisper on a smaller panel and gradually lose sharpness on bigger monitors.

A computer display system's greatest resolution is determined by its physical ability to concentrate light (in which case the physical dot size, or dot pitch, corresponds to the pixel size), and it generally has multiple lower resolutions. The greatest resolution on a particular display may provide a crisper image, but it will be distributed across a region that is too tiny to read comfortably.

The resolution of a display is not evaluated in dots per inch as it is with printers. The pixels per inch may be determined by combining the resolution and the physical display size. PC displays typically have a pixel density of 50 to 100 per inch. A 15-inch VGA monitor, for example, has a resolution of 640 pixels per inch across a 12-inch horizontal line (see display modes). A VGA display with a reduced resolution would have more pixels per inch.

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