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There seem to be two classes of digital pens:

(1) those that write on special paper

(2) those that have a separate device that senses the position of the pen.

I am aware of academic and research digital pens that are entirely self contained.  Some motion sensing. Some video based - like an optical mouse, they detect motion on nearly any surface that has texture.  (Even when lifted off....)

But I am not aware of any commercial product where the digital pen is entirely self sufficient.

I want such a product.

...

But...  oh shoot, special paper is the marketeer's dream.  Razor blades. Printer ink.  Sell the pen, and then keep selling the supplies.  Patent protected, I'm sure.