Single-layer touch sensor
In one embodiment, a touch sensor includes a first electrode and a second electrode. At least a portion of the second electrode is interdigitated with the first electrode. The first electrode includes a base portion, a digit and an extent. The digit includes a first end and a second end, connects to the base portion at the first end, and extends from the base portion in a first direction along a first axis. The extent connects to the digit at the second end and extends from the digit along a second axis that is substantially perpendicular to the first axis.
1. A touch sensor comprising:
a first electrode that comprises:
a first base portion;
a second base portion that comprises a first end and a second end, connects to the first base portion at the first end, and extends substantially perpendicularly from the first base portion;
a third base portion that connects to the second end of the second base portion and extends substantially perpendicularly from the second base portion;
a first digit that comprises a first end and a second end, connects to the first base portion at the first end, and extends from the first base portion in a first direction along a first axis;
a first extent that connects to the first digit at the second end of the first digit and extends from the first digit along a second axis that is substantially perpendicular to the first axis;
a second digit that comprises a first end and a second end, connects to the third base portion at the first end, extends from the third base portion, and is substantially parallel to the first axis; and
a second extent that connects to the second digit at the second end of the second digit, extends from the second digit, and is substantially parallel to the second axis;
a second electrode that comprises:
a base portion; and
a digit that comprises a first end and a second end, connects to the base portion of the second electrode at the first end, and extends substantially perpendicularly from the base portion of the second electrode, the digit of the second electrode being at least partially interdigitated with the first digit of the first electrode and the second base portion of the first electrode; and
a third electrode that comprises:
a base portion; and
a digit that comprises a first end and a second end, connects to the base portion of the third electrode at the first end, and extends substantially perpendicularly from the base portion of the third electrode, the digit of the third electrode being at least partially interdigitated with the second digit of the first electrode and the second base portion of the first electrode.
2. The touch sensor of claim 1 , wherein the first electrode is a sense electrode and the second electrode is a drive electrode.
3. The touch sensor of claim 1 , wherein:
the first base portion of the first electrode extends parallel to the second axis;
the first digit of the first electrode extends substantially perpendicularly to the first base portion; and
the first extent is substantially parallel to the first base portion.
4. The touch sensor of claim 1 , wherein:
the first base portion of the first electrode extends diagonally to the second axis;
the first digit of the first electrode extends substantially obliquely to the first base portion; and
the first extent is not substantially parallel to the first base portion.
5. The touch sensor of claim 1 , wherein:
the first electrode composes a first electrode line extending along the second axis; and
the second electrode is one of a plurality of second electrodes composing a second electrode line extending along the first axis.
6. The touch sensor of claim 5 , wherein the first electrode:
comprises a plurality of base portions that are each connected to at least one adjacent base portion; and
extends along the second axis in a serpentine pattern.
7. The touch sensor of claim 1 , wherein the first electrode comprises a plurality of digits that extend from the first base portion in the first direction along the first axis.
8. The touch sensor of claim 1 , wherein:
a first portion of the first extent extends from the first digit of the first electrode along the second axis in a first direction; and
a second portion of the first extent extends from the first digit of the first electrode along the second axis in a second direction that is opposite the first direction.
9. The touch sensor of claim 1 , wherein the first and second electrodes are each made of a mesh of fine lines of conductive material.
10. The touch sensor of claim 1 , wherein the first and second electrodes are each made of indium tin oxide (ITO).
11. A device comprising:
a touch sensor comprising:
a first electrode that comprises:
a first base portion;
a second base portion that comprises a first end and a second end, connects to the first base portion at the first end, and extends substantially perpendicularly from the first base portion;
a third base portion that connects to the second end of the second base portion and extends substantially perpendicularly from the second base portion;
a first digit that comprises a first end and a second end, connects to the first base portion at the first end, and extends from the first base portion in a first direction along a first axis;
a first extent that connects to the first digit at the second end of the first digit and extends from the first digit along a second axis that is substantially perpendicular to the first axis;
a second digit that comprises a first end and a second end, connects to the third base portion at the first end, extends from the third base portion, and is substantially parallel to the first axis; and
a second extent that connects to the second digit at the second end of the second digit, extends from the second digit, and is substantially parallel to the second axis;
a second electrode that comprises:
a base portion; and
a digit that comprises a first end and a second end, connects to the base portion of the second electrode at the first end, and extends substantially perpendicularly from the base portion of the second electrode, the digit of the second electrode being at least partially interdigitated with the first digit of the first electrode and the second base portion of the first electrode;
a third electrode that comprises:
a base portion; and
a digit that comprises a first end and a second end, connects to the base portion of the third electrode at the first end, and extends substantially perpendicularly from the base portion of the third electrode, the digit of the third electrode being at least partially interdigitated with the second digit of the first electrode and the second base portion of the first electrode; and
one or more computer-readable non-transitory storage media comprising logic that is configured when executed to control the touch sensor.
12. The device of claim 11 , wherein the first electrode is a sense electrode and the second electrode is a drive electrode.
13. The device of claim 11 , wherein:
the first base portion of the first electrode extends parallel to the second axis;
the first digit of the first electrode extends substantially perpendicularly to the first base portion; and
the extent is substantially parallel to the first base portion.
14. The device of claim 11 , wherein:
the first base portion of the first electrode extends diagonally to the second axis;
the first digit of the first electrode extends substantially obliquely to the first base portion; and
the first extent is not substantially parallel to the first base portion.
15. The device of claim 11 , wherein:
the first electrode composes a first electrode line extending along the second axis; and
the second electrode is one of a plurality of second electrodes composing a second electrode line extending along the first axis.
16. The device of claim 15 , wherein the first electrode:
comprises a plurality of base portions that are each connected to at least one adjacent base portion; and
extends along the second axis in a serpentine pattern.
17. The device of claim 11 , wherein the first electrode comprises a plurality of digits that extend from the first base portion in the first direction along the first axis.
18. The device of claim 11 , wherein:
a first portion of the first extent extends from the first digit of the first electrode along the second axis in a first direction; and
a second portion of the first extent extends from the first digit of the first electrode along the second axis in a second direction that is opposite the first direction.
19. The device of claim 11 , wherein the first and second electrodes are each made of a mesh of fine lines of conductive material.
20. The device of claim 11 , wherein the first and second electrodes are each made of indium tin oxide (ITO).