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Perhaps something to use an iPad as a second screen?

That did be a great idea by itself.

Still, when wanting to carry a really small laptop, an ipad is quit an additional weight.

Are you sure a portable 15" screen with today's technology would be lighter than the iPad?

if the same miniaturization technologies as Ipad were used, wouldn't the 15" have a lesser weight/unit screen area, when the computing electronics/battery components are removed?

Or for that matter another pure screen gadget the same size as Ipad, it would be lot lighter than the ipad itself. wouldn't it be?

Judging by the pictures on iFixit[1], the PCB and the battery don't look very heavy.

1. http://www.ifixit.com/Teardown/iPad-Wi-Fi-Teardown/2183/2

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