This is an idea I've kicked around for a long time as well when I noticed that my laptop probably never gets's used more than about 50ft from one spot in the house. I'm kind of suprised not to have seen it done. There are wireless LCD TV's on the market where the TV tuner is in a base unit which beams the video signal to the battery-powered LCD screen. You could actually rig something up with one of those as a proof of concept. Just need a video card that hooks up to a TV video input. Add a bluetooth keyboard and your in business.
Maybe there is some technical reason you don't see wireless PC monitors? Would the amount of signal going through the video cable eat up too much bandwith to be done wirelessly and be practical. Have you ever noticed that the video cable is always much thicker and stiffer than the mouse and keyboard cable? There must be something different about the signal.
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