It's probably an important distinction between laptops and tablets that a laptop is free to expand into three dimensions when in use.
Strictly speaking, the throw of the keyboard when in use is not limited by the dimensions of the laptop when it's not in use. There is air above and sometimes below that the keys can occupy. Having the keys raise up when opening the lid might be mechanically impractical, but having the lid depress all of the keys is a matter of ignoring key presses until the lid is opened past an angle where it stops touching the top row of keys.
Based on the shape of the smudges on my screen I'm pretty sure that already happens to an extent.
Strictly speaking, the throw of the keyboard when in use is not limited by the dimensions of the laptop when it's not in use. There is air above and sometimes below that the keys can occupy. Having the keys raise up when opening the lid might be mechanically impractical, but having the lid depress all of the keys is a matter of ignoring key presses until the lid is opened past an angle where it stops touching the top row of keys.
Based on the shape of the smudges on my screen I'm pretty sure that already happens to an extent.