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TV Resolutions in a Nutshell

Part of the Apple TV For Dummies Cheat Sheet

The following table gives you a rundown of the resolution, aspect ratio, and number of scan lines for the three types of television (standard-definition TV, digital TV, and high-definition TV).

Name Signal Type Number of Scan Lines Aspect Ratio Resolution
SDTV Analog 480 4:3 720 x 480
DTV Digital 480 4:3 or 16:9 704 x 480 or 640 x 480
HDTV Digital 1080i (interlaced) or 720p (progressive) 16:9 1920 x 1080i (interlaced) or 1280 x 720p (progressive)
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Apple TV For Dummies Cheat Sheet


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