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The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, typically measured in inches. It is also sometimes called the physical image size to distinguish it from the "logical image size," which describes a screen's display resolution and is measured in pixels. [1] [2]
Screen shape Largest known diagonal Typical use Usable in bright room (in) (cm) Eidophor front projection Flat (limited only by brightness) TV: No Shadow mask CRT: Spherical curve or flat 42 [1] 107 TV, computer monitor: Yes Aperture grille CRT: Cylindrical curve or flat 42 [2] 107 TV, computer monitor: Yes Monochrome CRT: Spherical curve or ...
The performance of a monitor is measured by the following parameters: Display geometry: Viewable image size – is usually measured diagonally, but the actual widths and heights are more informative since they are not affected by the aspect ratio in the same way. For CRTs, the viewable size is typically 1 in (25 mm) smaller than the tube itself.
Some common aspect ratios for computer displays. 4:3 is an old non-widescreen monitor standard, also used in some tablet computers. The first popular widescreen ratio for computer displays was 16:10, and 16:9 has been the most common ratio since 2012.
Various computer display standards or display modes have been used in the history of the personal computer. They are often a combination of aspect ratio (specified as width-to-height ratio), display resolution (specified as the width and height in pixels ), color depth (measured in bits per pixel), and refresh rate (expressed in hertz ).
The apparent PPI of a monitor depends upon the screen resolution (that is, the number of pixels) and the size of the screen in use; a monitor in 800×600 mode has a lower PPI than does the same monitor in a 1024×768 or 1280×960 mode. The dot pitch of a computer display
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An SXGA+ display is used on a few 12-inch laptop screens such as the ThinkPad X60 and X61 (both only as tablet) as well as the Toshiba Portégé M200 and M400, but those are far less common. At 14.1 inches, Dell offered SXGA+ on many of the Latitude C-Series laptops, such as the C640, and IBM since the ThinkPad T21.