When overlapped with their center points aligned, he found that all of those aspect ratio rectangles fit within an outer rectangle with an aspect ratio of 1.7 7:1 and all of them also covered a smaller common inner rectangle with the same aspect ratio 1.77:1. Powers cut out rectangles with equal areas, shaped to match each of the popular aspect ratios. The popular choices in 1980 were 4:3 (based on TV standard's ratio at the time), 15:9 (the European "flat" 1.6 6:1 ratio), 1.85:1 (the American "flat" ratio) and 2.35:1 (the CinemaScope/ Panavision) ratio for anamorphic widescreen. Powers, a member of the SMPTE Working Group on High-Definition Electronic Production, first proposed the 16:9 (1.7 7:1) aspect ratio in 1984, when nobody was creating 16:9 videos. The calculation considers the extreme rectangles, where m and n are multipliers to maintain their respective aspect ratios and areas.ĭr. DVD producers can also choose to show even wider ratios such as 1.85:1 and 2.40:1 within the 16:9 DVD frame by hard matting or adding black bars within the image itself.ĭerivation of the 16:9 aspect ratioThe main figure shows 4:3, 1.85:1, and 2.35:1 rectangles with the same area A, and 16:9 rectangles that covers (black) or is common to (grey) them. Many digital video cameras have the capability to record in 16:9, and 16:9 is the only widescreen aspect ratio natively supported by the DVD standard. Japan's Hi-Vision originally started with a 5:3 (1.6 6:1) ratio but converted when the international standards group introduced a wider ratio of 16 to 9. It has replaced the "fullscreen" 4:3 aspect ratio.ġ6:9 (1.7 7:1) (said as sixteen by nine or sixteen to nine) is the international standard format of HDTV, non-HD digital television and analog widescreen television systems PALplus and Wide-aspect Clear-vision. Once seen as exotic, since 2009, it has become the most common aspect ratio for televisions and computer monitors, and is also the international standard image format for UHD, HDTV, Full HD and SD digital television. An image on a 21-inch monitor with an 800圆00 resolution will not appear nearly as sharp as it would on a 15-inch display at 800圆00.An LCD television set with a 16:9 image ratio.ġ6:9 (1.7 7:1) is a widescreen aspect ratio with a width of 16 units and height of 9. The same pixel resolution is sharper on a smaller monitor and fuzzier on a larger monitor because the same number of pixels is spread out over a larger number of inches. Obviously, the size of the display directly affects resolution. For professional applications, such as medical imaging or public information displays, some LCD monitors are 40 inches or larger! As technologies improve in both desktop and notebook displays, even larger screen sizes are becoming available. Notebook screen sizes are smaller, typically ranging from 12 to 17 inches. Popular screen sizes are 15, 17, 19 and 21 inches. This is the measurement of a CRT display without its outside casing. For a more accurate representation of a CRT's size, find out its viewable screen size. Because of the differences in how CRT and LCD monitors are measured, a 17-inch LCD display is comparable to a 19-inch CRT display. The measurement does not include the casing as indicated in the image below. In other words, the exterior casing is included in the measurement as seen below.įor LCD monitors, screen size is measured diagonally from the inside of the beveled edge. For CRT monitors, screen size is measured diagonally from outside edges of the display casing. Interestingly, the way in which the screen size is measured for CRT and LCD monitors is different. This diagonal measuring system actually came about because the early television manufacturers wanted to make the screen size of their TVs sound more impressive. Screen sizes are normally measured in inches from one corner to the corner diagonally across from it. All types of displays include a projection surface, commonly referred to as the screen.
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