Digital pen sensor surface

1. An electronic device, comprising:

an active digital pen sensor surface to generate analog position information, wherein the active digital pen sensor surface includes a projective capacitive sensor layer with a variance of sheet resistance of less than plus or minus 20 percent; and

a controller, including a sigma-delta analog-to-digital (A-to-D) converter, to generate digital pen position information based on the analog position information, and perform a triangulation based on the digital pen position information to determine a pen position.

2. The electronic device of claim 1 , wherein the projective capacitive sensor layer has a variance of sheet resistance of less than plus or minus 10 percent.

3. The electronic device of claim 1 , wherein the projective capacitive sensor layer has a variance of sheet resistance of less than plus or minus 3 percent.

4. The electronic device of claim 1 , wherein the projective capacitive sensor layer has a sheet resistance of at least an average of 200 ohms/sq.

5. The electronic device of claim 1 , wherein the projective capacitive sensor layer has a sheet resistance of at least an average of 400 ohms/sq.

6. The electronic device of claim 1 , wherein the projective capacitive sensor layer is fabricated from poly(3,4-ethylenedioxythiophene) (PEDOT) film.

7. The electronic device of claim 6 , wherein the active digital pen sensor surface includes a first projective capacitive PEDOT film with rows of electrodes stacked over a second projective capacitive PEDOT film with columns of electrodes.

8. The electronic device of claim 1 , wherein the triangulation includes using a signal from a trace intersection of the active digital pen sensor surface closest to a pen tip touch down location, and signals from other trace intersections surrounding the touch down location.

9. A method, comprising:

generating analog position information with an active digital pen sensor surface that includes a projective capacitive sensor layer with a variance of sheet resistance of less than plus or minus 20 percent;

converting, with a sigma-delta analog-to-digital (A-to-D) converter, the analog position information to digital position information; and

determining, via a controller, a pen position by performing a triangulation based on the digital position information.

10. The method of claim 9 , wherein the projective capacitive sensor layer has a variance of sheet resistance of less than plus or minus 5 percent.

11. The method of claim 10 , wherein the projective capacitive sensor layer has a sheet resistance of at least an average of 300 ohms/sq.

12. The method of claim 9 , wherein the projective capacitive sensor layer is fabricated from poly(3,4-ethylenedioxythiophene) (PEDOT) film.

13. An electronic device, comprising:

an active digital pen projective capacitive sensor surface to generate analog position information, wherein the active digital pen projective capacitive sensor surface includes a projected capacitive sensor fabricated from poly(3,4-ethylenedioxythiophene) (PEDOT) film; and

a controller, including a sigma-delta analog-to-digital (A-to-D) converter, to generate digital pen position information based on the analog position information, and perform a triangulation based on the digital pen position information to determine a pen position, wherein the PEDOT film has a variance of sheet resistance of less than plus or minus 5 percent to help facilitate an accurate determination of the pen position based on the triangulation.

14. The electronic device of claim 13 , wherein the electronic device is a display device.

15. The electronic device of claim 13 , wherein the electronic device is an indirect inking device.