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1080i/p

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1080i refers to video containing 1080 horizontal lines of resolution, stored in an interlaced fashion. 1080p refers to the progressive nature of the storage.


1080i/p Confusion

There is a great deal of confusion regarding the differences between 1080i and 1080p.

For film content on Blu-ray or HD DVD, they are stored as 1080p/24, which means a 1080-line progressive video with 24 frames per second. Some HD DVD players only have 1080i output, and some displays only have 1080i inputs (even when they support 1080p mode) - this has led some to believe that players/displays with 1080p output/input will produce a superior picture. This is not entirely true, in fact, in most cases, this is not true at all. It is easier to explain with an example:

A Blu-ray player has 1080p output 24 fps. The Blu-ray movie being played is stored in 1080p/24 fashion. The display connected to the Blu-ray player has a native resolution of 1080 lines, and it supports both 1080i and 1080p input. With this connection

A HD DVD player has 1080i output at 60 Hz (60 fields per second). The HD DVD movie being played is stored in 1080p/24 fashion. The display connected to the HD DVD player has a native resolution of 1080 lines, and it has both 1080i and 1080p input.