There are two types of High Def, 720 and 1080, referring to the number of lines in the image.
720 is better than a standard definition telly, but 1080 is the real deal. The 'p' refers to the fact that the set is compatible with progressive scan mode, where every line is refreshed every frame rather than only 50% of them. Surprisingly, Sky did not go for progressive scan in their standard, so it is more important for Blue-ray than for TV.
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