A half-width input module that’s a touch screen, and whose height is both the keyboard and trackpad areas. With the same pixel density as the main screen, can be used as a secondary one, and being a touch one, can be used an on-screen touchpad that can be hidden on demand.
My idea is to have a split keyboard and put the full heigh touch screen in the center, working the lower half as a touch pad, and the upper half as an extension of the main screen. Think of distribution like a sort of a BIG Nintendo DS but with two half keyboards (and no keypad) instead of joysticks and buttons
Ok, page is in russian, so I don’t know if it was a prototype or an actual model, but that’s JUST what I was asking for… except for being an expandable keyboard
At Notebook Pc Keyboard Splits Open to Reveal 2nd Screen there’s the original article in english, it seems the patents were from 1994 to 1997 and last news where that they would go into production in 2008, but the webpage link return a 404, and the company web page is empty and looks like parked, so maybe is it safe to implement?
Now I’m thinking, ortholineal keyboards could be able to provide more space to have a bigger and more usable screen in the middle, the width of the numpad. I see it totally feasable. Problem with connectors positions is that they would not allow to swap the keyboards, but we can take advantage of that and make space keys wider, so this way we can easily identify what keyboard is one (left or right).
It’s EXACTLY what I was looking for! Just only with a touch screen as an input module in the middle instead of “just” a trackpad, and not so much keys at the right so the touch screen can be centered
What I meant was NOT to do the split in other place of between G and H, but about removing keys space on the right. I have checked it, and removing the home column and making smaller the column of the enter key, would be enough. Later would be just a matter of making smaller the right space key and making the arrow keys half height as some keyboards do so they fit in just the lower row. Maybe the Enter key gets a bit small, but I totally see it possible to do.
but with two half keyboards (and no keypad) instead of joysticks and buttons 
magic 