According to one embodiment, a touch sensor has a first edge and a second edge approximately perpendicular to the first edge. The touch sensor includes a first plurality of electrodes approximately parallel to the first edge, and a second plurality of electrodes. Each of the second plurality of electrodes has a spine that is approximately parallel to the second edge and a plurality of conductive elements that are approximately parallel to the first edge and in physical contact with the spine. At least one electrode of the second plurality of electrodes is adjacent to the second edge. The spine of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of the spine of at least one of the other electrodes of the second plurality of electrodes.
1. A device comprising:
a touch sensor having a first edge and a second edge approximately perpendicular to the first edge, the touch sensor comprising:
a first plurality of electrodes approximately parallel to the first edge; and
a second plurality of electrodes, each of the second plurality of electrodes having a spine that is approximately parallel to the second edge and a plurality of conductive elements that are approximately parallel to the first edge and in physical contact with the spine, wherein at least one electrode of the second plurality of electrodes is adjacent to the second edge;
wherein the spine of the electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of the spine of at least one of the other electrodes of the second plurality of electrodes;
wherein respective capacitive couplings between the first plurality of electrodes and the second plurality of electrodes form a plurality of nodes; and
wherein respective capacitances of the nodes are approximately the same.
2. The touch sensor of claim 1 , wherein the one electrode of the second plurality of electrodes that is adjacent to the second edge has two spines that are separated from each other by a first gap;
wherein the spines of the other electrodes of the second plurality of electrodes are each separated from each other by a second gap; and
wherein the first gap has a width that is less than a width of at least one of the second gaps.
3. The touch sensor of claim 1 , wherein at least one of the plurality of conductive elements of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of one of the other conductive elements of the second plurality of electrodes.
4. The touch sensor of claim 1 , wherein the plurality of conductive elements of each of the second plurality of electrodes are each separated from each other by a gap;
wherein one of the gaps of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is less than a width of at least one of the other gaps of the second plurality of electrodes.
5. A touch sensor having a first edge and a second edge approximately perpendicular to the first edge, the touch sensor comprising:
a first plurality of electrodes approximately parallel to the first edge;
a second plurality of electrodes, each of the second plurality of electrodes having a plurality of spines coupled to one another, each of the spines being approximately parallel to the second edge, wherein at least one electrode of the second plurality of electrodes is adjacent to the second edge;
wherein at least one of the spines of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of a spine at least one of the other electrodes of the second plurality of electrodes;
wherein respective capacitive couplings between the first plurality of electrodes and the second plurality of electrodes form a plurality of nodes; and
wherein respective capacitances of the nodes are approximately the same.
6. The touch sensor of claim 5 , wherein one of the spines of the one electrode of the second plurality of electrodes that is adjacent to the second edge has one or more conductive elements physically coupled to the spine, wherein each of the conductive elements is approximately parallel to the first edge, wherein none of the conductive elements couple the spines together.
7. A device, comprising:
a controller; and
a touch sensor having a first edge and a second edge approximately perpendicular to the first edge, the touch sensor coupled to the controller, the touch sensor comprising:
a first plurality of electrodes approximately parallel to the first edge;
a second plurality of electrodes, each of the second plurality of electrodes having a spine that is approximately parallel to the second edge and a plurality of conductive elements that are approximately parallel to the first edge and in physical contact with the spine, wherein at least one electrode of the second plurality of electrodes is adjacent to the second edge; and
wherein the spine of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of the spine of at least one of the other electrodes of the second plurality of electrodes;
wherein respective capacitive couplings between the first plurality of electrodes and the second plurality of electrodes form a plurality of nodes; and
wherein respective capacitances of the nodes are approximately the same.
8. The device of claim 7 , wherein the one electrode of the second plurality of electrodes that is adjacent to the second edge has two spines that are separated from each other by a first gap;
wherein the spines of the other electrodes of the second plurality of electrodes are each separated from each other by a second gap; and
wherein the first gap has a width that is less than a width of at least one of the second gaps.
9. The device of claim 7 , wherein at least one of the plurality of conductive elements of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of one of the other conductive elements of the second plurality of electrodes.
10. The device of claim 7 , wherein the plurality of conductive elements of each of the second plurality of electrodes are each separated from each other by a gap;
wherein one of the gaps of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is less than a width of at least one of the other gaps of the second plurality of electrodes.
11. A device, comprising:
a controller; and
a touch sensor having a first edge and a second edge approximately perpendicular to the first edge, the touch sensor coupled to the controller, the touch sensor comprising:
a first plurality of electrodes approximately parallel to the first edge;
a second plurality of electrodes, each of the second plurality of electrodes having a plurality of spines coupled to one another, each of the spines being approximately parallel to the second edge, wherein at least one electrode of the second plurality of electrodes is adjacent to the second edge; and
wherein at least one of the spines of the one electrode of the second plurality of electrodes that is adjacent to the second edge has a width that is greater than a width of a spine at least one of the other electrodes of the second plurality of electrodes;
wherein respective capacitive couplings between the first plurality of electrodes and the second plurality of electrodes form a plurality of nodes; and
wherein respective capacitances of the nodes are approximately the same.
12. The device of claim 11 , wherein one of the spines of the one electrode of the second plurality of electrodes that is adjacent to the second edge has one or more conductive elements physically coupled to the spine, wherein each of the conductive elements is approximately parallel to the first edge, wherein none of the conductive elements couple the spines together.