1080 means resolution of 1920x1080, i stands for interlaced, which means two fields of half-quality image are being unpercievably rapidly swapped in every frame of such display, in outcome it has half the image quality as opposed to progressive 1080p. As a counsequence of which, framerate is being mentioned in Fields per seconds, that means interlaced displays have half the framerate and sharpness as progressive displays, where famerate is in full Frames per second.
Informed friend of dood 1: no, it's in fact below 720p. The quality rises like this: 480i 480p 1080i 720p 1080p.
"Wanna come over my house to play Gears of War in 1080i?"