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16:9 is a widescreen aspect ratio with a width of 16 units and height of 9 units. Once seen as an "exotic" aspect ratio, [ 1 ] since 2009, it has become the most common aspect ratio for televisions and computer monitors , and is also the universal standard image format for the universal 1080p , 2160p and 4320p formats.
An array of 1280 × 720 on a 16:9 display has square pixels, but an array of 1024 × 768 on a 16:9 display has oblong pixels. An example of pixel shape affecting "resolution" or perceived sharpness: displaying more information in a smaller area using a higher resolution makes the image much clearer or "sharper".
Its square-pixel aspect ratio is 15:9 (or 5:3), in contrast to HDTV's 16:9 and 1280 × 800 's 16:10. It is also the lowest resolution that might be found in an " Ultrabook " standard laptop, as it satisfies the minimum horizontal and vertical pixel resolutions required to officially qualify for the designation.
This standard, which is the basis for HDMI, specifies 16:15 (1.0666) as the pixel aspect ratio of 4:3 576i/p and 8:9 (0.888) as the pixel aspect ratio of 4:3 480i/p. Pirazzi, Chris. "Square and Non-Square Pixels" Pirazzi, Chris. "Programmers' Guide to Video Systems" Poynton, Charles (2002).
These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed "Cinemascope", "21∶9" etc.), while the standard horizontal resolution, e.g. 1920 pixels, is usually kept.
Common aspect ratios for displays, past and present, include 5:4, 4:3, 16:10, and 16:9. To distinguish: The display aspect ratio (DAR) is calculated from the physical width and height of a display, measured each in inch or cm (Display size). The pixel aspect ratio (PAR) is calculated from the width and height of one pixel.
In actual images, these extra pixels are often partly or entirely black, as only the center 704 horizontal pixels carry actual 4:3 or 16:9 image. Hence, the actual pixel aspect ratio PAR for PAL video is a little different from that given by the formula, specifically 12:11 for PAL and 10:11 for NTSC.
This resolution has an aspect ratio of 16∶9, with 8,294,400 total pixels. It is exactly double the horizontal and vertical resolution of 1080p ( 1920 × 1080 ) for a total of 4 times as many pixels, and triple the horizontal and vertical resolution of 720p ( 1280 × 720 ) for a total of 9 times as many pixels.