A touch sensor includes a first, second, and third electrode line on one side of a substrate. The first and second electrode lines extend along a first direction, and the third electrode line extends at an angle to the first direction. The first electrode line includes a set of first electrodes that decrease in length along the first direction. The second electrode line includes a set of second electrodes that increase in length along the first direction. The third electrode line includes third and fourth electrodes. A set of the third electrodes decrease in length along the first direction and are interdigitated with the first electrodes. A set of the fourth electrodes increase in length along the first direction and are interdigitated with the second electrodes. The first, second, third, and fourth electrodes are substantially perpendicular to the first direction.