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Resolution|
In video, resolution is determined by the horizontal and vertical scan lines. Each scan line is made up of lines of dots—picture elements (“pixels”). When you receive a picture source into your traditional picture tube TV, (CRT) and big screen rear projection TVs, it is scanned line by line to create the picture. The picture is not scanned on "fixed pixel" TVs like plasma, DLP, LCDs, “fixed pixel” TVs. Resolution is determined by the number of pixels counted in horizontal rows from top to bottom (“horizontal resolution”). What you need to know is: The more lines, the clearer, brighter and more real the picture becomes. And that’s why you care. One major advantage of HDTV is resolution. An HDTV can have as many as 1,080 lines of resolution compared to the 480 active line maximum seen on a traditional analog TV. While a traditional analog TV has a total of about 200,000 pixels, a high definition can have up to 10 x as many, or 2 million pixels! It’s like looking at a photograph!
For
some time, salespeople and manufacturers have touted that a certain
analog TV has 700 or even 1,000 lines of resolution. This refers
to the vertical resolution. An analog TV with 1,000 lines of
vertical resolution is still not capable of showing a high definition
picture in High Definition.  
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