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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]
A common size for LCDs manufactured for small consumer electronics, basic mobile phones and feature phones, typically in a 1.7" to 1.9" diagonal size. This LCD is often used in portrait (128×160) orientation. The unusual 5:4 aspect ratio makes the display slightly different from QQVGA dimensions. 160×128 (20k) 160 128 20,480 5:4 UNNAMED UNNAMED
Find the optimal distance for a given screen. Example: for a 4K UHD screen 140 cm high (112 inches diagonal), the optimal distance is 140 × 1.6 = 224 cm. Find the right screen size. Example: for a 1080 HDTV used at a distance of 250 cm, you need to find a screen whose height is close to 250 / 3.2 = 78 cm (63 inches diagonally).
The standard aspect ratio for computer software, videogames, and analog video until the 2000s, as well as for early 35 mm film. Used on some modern devices such as the iPad. 3:2 (1.5:1) 2160×1440, 2560×1700 †, 3000x2000, 1500x1000 Used in some portable PCs since the early 2010s.
The LCD Smartie forums are the primary source for support and developer discussion. To facilitate the use of LCD Smartie on modern PCs running version of Windows 7 and 8 the team has started working on a USB interface to connect LCDs to a PC that does not require any additional kernel driver and provides a complete plug-and-play experience.
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For perspective, such a device at 15 inch (38 cm) screen size would have to display more than four Full HD screens (or WQUXGA resolution). The PPI pixel density specification of a display is also useful for calibrating a monitor with a printer. Software can use the PPI measurement to display a document at "actual size" on the screen.
The below distinguish SAR (aspect ratio of pixel dimensions), DAR (aspect ratio of displayed image dimensions), and the corresponding PAR (aspect ratio of individual pixels), though it currently contains some errors (inconsistencies), as flagged.