Startup Idea : Comfortable on-screen keyboard

Problem. The screen of a smartphone is rather small, so the keys on an on-screen keyboard are tiny and thus such a keyboard is usually far from being comfortable. Solution. An on-screen keyboard working in the following way: - while you’re bringing a finger closer to a certain part of it, this part is automatically becoming zoomed in, proportionally to how close the finger is located at the moment (and up to a certain limit, where the key under the fingertip is magnified enough for comfortable clicking); - and vice versa, while you’re bringing the finger farther away, the corresponding part of the keyboard is automatically becoming zoomed out, proportionally to how far away the finger is located at the moment (and up to a certain limit, where the entire keyboard is visible).