On2D displays, such ascomputer monitors andTVs,display size orviewable image size (VIS) refers to the physical size of the area wherepictures andvideos are displayed. The size of a screen is usually described by the length of itsdiagonal, which is the distance between opposite corners, typically measured in inches. It is also sometimes called thephysical image size to distinguish it from the "logical image size", which describes a screen'sdisplay resolution and is measured inpixels.^[1][2]

The method of measuring screen size by its diagonal was inherited from the first generation of televisions, which used circularcathode ray tube displays. Being circular, the externaldiameter of the bulb was used to describe their size. Since these circular tubes displayed rectangular images, the diagonal measurement of the visible rectangle was smaller than the diameter of the tube due to the thickness of the glass surrounding thephosphor screen, which was hidden from the viewer by thecasing andbezel. This method continued even when cathode ray tubes were manufactured as rounded rectangles. It had the advantage of being a single number specifying the size and was not confusing when theaspect ratio was universally 4:3. In theUS, whenvirtually allTV tubes were 4:3, the size of the screen was given as the true screen diagonal with a ‘V’ following it (this was a requirement in the US market, but not elsewhere). In virtually all other markets, the size of the outer diameter of the tube was given. A 27V in the US could be a 28" elsewhere. However, the V terminology was frequently dropped in USadvertising referring to a 27V as a 27". This was not misleading for the consumer as the seller had to give the actual screen size by law.Flat panel displays by contrast use the diagonal of their visible display size, thus the size is the actual size presented to the viewer in all markets. This means that a similarly specified size of display will be larger as a flat panel display compared with acathode ray tube display.

When the common aspect ratio shifted from 4:3 to 16:9, the new widescreens were labeled with a W in the US. A screen that is about the same height as a 27V would be a 32W.Vizio and other US TV manufacturers have introduced even wider screens with a 21:9 aspect ratio to match aspect ratios used incinemas. To gauge the relative sizes of these new screens, the screen aspect must be considered. In a commercial market where multiple aspect ratios are being sold, it will always take two numbers to describe the screen size, some combination of diagonal, aspect ratio, height or width.

Set sizes are frequently given as a ‘class’ as screens from different manufacturers will have slight variances in size. However, the "class" should be within 1/2" of the actual size. The reasons for the different sizes within a class stem from variances in the manufacturers' equipment. As manufacturers move from one size to another, newer larger sizes must fit on the same size glass, though with fewer displays being cut from it. Some sizes fit well and maximize glass utilization, while other sizes fit more poorly and waste glass. For example, in some cases, increasing the screen size by even 0.1” can cause anLCD manufacturer to go from 12 screens fitting on their glass sheet to 9.

The resolution of the human eye (with20/20 vision) is about oneminute of arc. For fullHDTV resolution, this one minute of arc implies that the TV watcher should sit3.2 times the height of the screen away (optimal viewing distance). At this distance, the individual pixels cannot be resolved while simultaneously maximizing the viewing area. For more TVresolutions, see "The optimal viewing distance".^[3][4]

The TV image is composed of many lines of pixels. Ideally, the TV watcher sits far enough away from the screen that the individual lines merge into one solid image. The watcher may sit even further away and still see a good picture, but it will occupy a smaller portion of theirvisual field.

Common screen dimensions are listed in the table below (the most common diagonal dimensions in inches as of 2020 are bolded). If the display is not listed, then the following equations can be used. Note thatD is the diagonal (in centimeters or inches),W is the width (in pixels), andH is the height (in pixels).

• Display resolution
• Computer display standard

• Display technology
• Digital imaging
• Television technology
• Television terminology
• Video signal

• Articles with short description
• Short description is different from Wikidata