Well here is a short note on a gigantic subject. My main purpose is to collect some information about video resolution designations like 720p This discussion mostly glosses over refresh rates.

HDTV broadcast is all done in the widescreen 16:9 aspect ratio format. The designation number (like the 720 in 720p) indicates the number of horizontal scan lines in the image (modern displays don't really scan, but never mind).

The letter p or i indicates progressive or interlaced. Progressive is better. Interlaced means that every other line gets updated on a screen refresh, reducing bandwidth at the expense of flicker. Progressive updates all lines on every refresh.

Some tips:

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Adventures in Computing /