Page "Liquid crystal display" Paragraph 74
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An additional consideration in spatial performance are viewing cone and aspect ratio.
The Aspect ratio is the ratio of the width to the height ( for example, 4: 3, 5: 4, 16: 9 or 16: 10 ).
Older, standard definition TVs were 4: 3.
Newer High Definition televisions ( HDTV ) are 16: 9, as are most new notebook computers.
Movies are often filmed in much different ( wider ) aspect ratios, which is why there will frequently still be black bars at the top and bottom of an HDTV screen.
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