Chicago TV Installer | What’s HD and What’s Not HD | Tips and Tricks

What’s HD and What’s Not HD: A digital television (DTV) is not necessarily HDTV. Not all flat-panel TVs qualify as HD either. So how can you distinguish real HDTV from the other stuff? Start with the dots and lines that form the picture.
Pixels, Lines, and Native Resolution: A DTV picture is made up of dots called pixels, or picture elements. Most DTVs are fixed-pixel devices with grids of vertical and horizontal pixels. The pixels are delivered in lines, or horizontal rows of pixels, scanned from the top of the screen to the bottom. Specify those two numbers, the vertical and horizontal pixels, and you’ve got native resolution.
More Pixels: HDTV: High-definition television (HDTV) has the highest native resolution in DTV, producing pictures with either 1080 by 1920 pixels (about two million total) or 720 by 1280 pixels (just under a million). Both are true HDTV. Anything with fewer than 720 vertical pixels or 1280 horizontal pixels is not HDTV–though it might be EDTV (enhanced-definition television) or SDTV (standard-definition television).
Less Pixels: EDTV and SDTV: A picture with 480 vertical pixels and 640+ horizontal pixels (more for widescreen) is either enhanced-definition television (EDTV) or standard-definition television (SDTV), depending on whether it uses progressive or interlaced scanning (see below). These formats are suitable for casual (not home theater) viewing and are typically available in screen sizes of 27 inches or less.

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