I used minumm keyboard a long time ago and it was actually good, 1-2 cm of keyboard height, sadly I think it's been discontinued long ago, but you can see a cou

I used minumm keyboard a long time ago and it was actually good, 1-2 cm of keyboard height, sadly I think it's been discontinued long ago, but you can see a couple of screenshots here http://minuum.com/ http://minuum.com/