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The type of screen your HDTV has (wide-screen or standard-screen) determines how the set-top box 

displays programs on the screen. The picture format for an HDTV is a combination of aspect ratio and 

screen resolution and is different for standard-screen and wide-screen HDTVs.

An aspect ratio is the ratio of the width to the height of the TV screen. The aspect ratios differ because 

the television industry manufactures both standard-screen and wide-screen HDTVs to appeal to consumer 

viewing preferences.  

The screen resolution indicates the amount of detail that the picture displays. Resolution is identified by 

the number of display lines on the screen. The techniques that an HDTV uses to “paint” the picture on the 

screen are referred to as progressive and interlaced.
With the progressive scanning method, the lines are drawn on the screen one at a time in sequential 

order. Progressive scanning results in a more detailed image on the screen and is also less susceptible to the 

flicker commonly associated with interlaced scanning. The interlaced method involves refreshing pixels in 

alternation — first the odd lines and then the even lines. 
For advanced setup, select the screen resolution that your TV can support. See your HDTV user manuals 

to choose the proper screen resolution (480i, 576i, 720p, 1080i, or 1080p) for your setup. 
For example, a screen resolution of 1080i indicates that the screen shows 1080 lines in an interlaced display, 

and 720p indicates that the screens shows 720 lines in a progressive display.

A standard-screen SDTV has a 4x3 

aspect ratio. The screen is 4 units wide for 

every 3 units tall.  

A wide-screen HDTV is one-third wider than 

a standard-screen HDTV. The screen is 16 units 

wide for every 9 units tall.

A screen resolution of 480i or 516i fills 

the screen.

A screen resolution of 720p or 1080i fills 

the screen.

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