Another question that I often hear is what’s the difference between 1080p and 720p or between 720p and 1080i?
The numbers 720p or 1080p represent the amount of lines or pixels making up the picture, basically the higher the number the higher the resolution means a sharper picture.
1080p represents 1080 horizontal lines creating the picture or 1920x1080 pixels. 720p represents 720 horizontal lines creating the picture or 1080x720 pixels.
Now what is 1080i? 1080i is equivalent to 720p, 720p represents 720 lines being shown all at one time (progressive) and 1080i represents 1080 lines with half being shown on the screen at one time and the other half switching every 1/60th of a second undetectable to the human eye (interlaced).
Any TV will show both interlaced and progressive images depending on the source being input.
720p(1080i) is the highest resolution shown from HD cable or satellite. The 1080p (1920i) quality is shown from such sources as Blu-Ray Disc (a new format taking over DVD) or the Sony Playstation 3 gaming system.