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16-VGA - • 60Hz or more 72Hz looks better Scanning Timing...

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VGA (video graphics array) ECE 2984
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Plug it in
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CRT
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CRT Guts
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Timing “back porch” “back porch” “front porch”
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Scanning Electron beam scans across Turned off when: Scanning back to the left (horizontal retrace) Scanning to the top (vertical retrace)
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Scanning TVs use interlacing Every other scan line is swept per field Two fields per frame (30Hz) Way to make movement less disturbing Computers use progressive scan Whole frame refreshed at once
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Unformatted text preview: • 60Hz or more, 72Hz looks better Scanning Timing Pixels to Video S3E Video Colors • Three colors of phosphor • Beams hit each • Black – beam off • White – all on Picture is a bit misleading. Mask (or aperture grill) ensures beams hit only correct color phosphor. S3E Colors More Information • WikiPedia has many useful links: http://en.wikipedia.org/wiki/Vga...
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