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- Lenovo X61, adaptor VGA to TV
December 6, 2007, 4:35 pm
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Re: Lenovo X61, adaptor VGA to TV
You need to understand that there is are many differences between VGA
and NTSC (or PAL) output. Laptops with TV output have all the necessary
circuitry to handle that. Either they have a second video-resolution
frame buffer for the video content, or they downsample the main frame
buffer on the fly to video resolution.
If you've got only an analog VGA output, you need a device called a
"scan converter" to accept analog VGA at some resolution your laptop can
generate. The scan converter will internally downsample resolution,
convert to interlaced display, and handle the colour encoding. Good
scan converters are not cheap.