Aspect Ratio

Aspect ratio is an indicator of the proportional relationship of the width to the height of the screen and is depicted with the expression x:y, where x equals the number of units wide and y equals the number of units high.

• 10" tablet (9.7" display)
• 4:3
• Smartphone (4.7" display)
• 16:9
• Leaderboard Ad
• 728:90
• HDTV
• 16:9

Consecutively scanning the lines of the picture from top to bottom is known as progressive scanning.

Early television standards adopted a method of raster scanning called interlaced scanning to minimize both bandwidth use and flickering.

Interlaced scanning reduces the bandwidth requirements of standard broadcast television by half compared to a progressively scanned image.