1080i (aka FHD and BT.709) is an abbreviation referring to a combination of frame resolution and scan type, in the domains of high-definition television (HDTV) and high-definition video. The number "1080" refers to the number of lines on the screen. The "i" is an abbreviation for "interlaced"; this indicates that only the odd lines, then the even lines of each frame (each image called a video field) are drawn alternately, so that only half the number of actual image frames are used to produce video. The term assumes a widescreen aspect ratio of 16:9 (a rectangular TV that is wider than it is tall), a spatial resolution of 1920 pixels × 1080 lines. A 1920 pixels × 1080 lines screen has a total of 2.1 megapixels (2.1 million pixels) and a temporal resolution of 50 or 60 interlaced fields per