A very impressive video made the rounds last year for the Cicret device; sine then, a prototype video has surfaced.
(Cicret bracelet video)
At present, Cicret is trying to raise funds for development; it's not clear whether or not this product will ever exist.
I was sure I had read the basic idea some years ago; sure enough, I found it in the works of John Varley, a 1992 novel Steel Beach:
By pressing the dots in different combinations with my fingertips I was able to write the story in shorthand, and watch the loops and lines scrawl themselves on a strip of readout skin on my wrist...
(Learn more about readout skin)
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SpaceX Intros Extravehicular Activity Suit
'Provision had been made to meet the terrific cold which we knew would be encountered the moment we had passed beyond the atmosphere.'
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'But the stars are only atoms in larger space, and in that larger space the star-atoms could combine to form living matter, thinking matter, couldn't they?'
Microsoft VASA-1 Creates Personal Video From A Photo
'...to build up a video picture would require, say, ten million decisions every second. Mike, you're so fast I can't even think about it. But you aren't that fast.'