1080i
What is 1080i Resolution in HDTVs?
1080i is the shorthand name for a format of high-definition video modes. 1080 denotes the number of horizontal scan lines — also known as vertical resolution — and the letter i stands for interlaced. In the alternate format of high-definition video mode, known as 1080p, the p would stand for progressive scan.
1080i is a high-definition television (HDTV) video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920 × 1080 or about 2.07 million pixels.
1080i is directly compatible with CRT-based HDTV sets. 1080i is displayed as is on 1080p-based televisions and is compatible with newer 720p-based televisions, but must be deinterlaced first in order to be displayed on those sets. A panel size used in mid-range HDTVs is 1366 x 768; these are often advertised as 1080i "compatible" or "HD ready" — however these HDTVs, while accepting a 1080i signal scales it down to the panel size of 1366x768 as these are physically incapable of displaying 1877x1000 (the actual displayed resolution of a 1920x1080 source) resolutions.
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