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1080i:
Abbreviation for 1080 interlaced, where 1080 represents 1,080 vertical pixels. The 1080i format creates an image with 1080 lines, each with 1920 pixels, so it has a resolution of 1920*1080. 1080i is the minimum resolution necessary to enjoy HD program, and in HDMI specifications 1.3a, Catogery 1 is equivalent to 1080i resolution.

1080p:
Abbreviation for 1080 progressive. 1080p has a resolution of 1920*1080 or 2,073,600 pixels totally in a progressive scan. The term can be referred to as full HD to differentiate it from other HDTV video modes, 1080p is the highest resolution currently on HDTV and HD-DVD system. In HDMI specifications 1.3a, Catogery 2 cable, sometimes referred to as High-Speed HDMI cable, is designed specially for 1080p signal delivery.

1440p:
An HD format consisting of 1920*1440 pixels in a progressive scan...