This is really cool but how do thee both communicate using touchscreen?? 
Future iPad keyboards could connect to the touchscreen
It’s using a compressed character pattern. The 256 Ascii characters can be made a few pixels in size, e.g. 4 pixels high, 1024 pixels wide strip, with a sensitivity of 4 pixels (so needs to be reasonably accurately aligned keyboard) a mechanical (unlikely) or an electrical capacitance electronic (more likely) on/off can be sensed by the touchscreen.
As if you placed accurately a stylus at that point but not being physical you earth that place or don’t.
Or if not quite reliable then two rows of 8 pixels size high, taking 16x1024 pixels. However big you need to make it reliable.
Really, a Patent for that… .it’s obvious. Very like Braille.
I doubt it will be popular as its going to take up some of the screen.
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Wow, so much into it… never thought touch screen can be used like this.
It’s an accuracy discussion. How few pixels, so how little of the screen, you can “touch” to not give a false signal. But it’s just a shrunken version of on-screen keyboard.
Replace finger with a small transistor place which presents earth or no.
My tablet use Pogo pins, works reliably for me, not bluetooth.
Unless Apple perfects that design, there is lot of uncertainty in the picture when compared to physical connectors or BT the worst case.
I have long held the view we’re way behind what we can do with direct neural interfaces. To use keyboards on ends of fingers down end of neurons… so … 20th century which was just evolved from 19th century.
Would solve a lot of battery issues, imagine 4K video direct into brain, no keyboard, no mouse, no screen.
(this from Fringe, Season 5, Episode 5, 41m43s )