A television's resolution is measured in two ways:

  1. How many pixels it can display vertically on the screen. As mentioned, an HDTV can display at least 720 vertical pixels. A lower resolution DTV may only display 480 pixels or fewer. Again, the more pixels, the better the picture.
  2. How the picture is drawn (scanned) on the screen. This can be either all at once ("progressive scan") or in two passes ("interlaced scan") � abbreviated "p" and "i," respectively. Progressive scan provides a smoother, flicker-free picture.

High Definition sets can offer resolutions of 720p, 1080i, and 1080p. 1080p is a great match for many HD video games and required for anyone who wants the full Blu-ray experience, as Blu-ray is 1080p "native" (i.e., not upscaled) resolution.

For watching standard HD programming, your customer needs a set that can display 720p or greater.