Touch sensor for non-uniform panels

A two-dimensional capacitive sensor comprising a cover panel of varying thickness and an electrode panel arranged under the cover panel, the electrode panel comprising a plurality of transmitter electrodes extending in a first direction and a plurality of receiver electrodes extending in a second direction, wherein an array of sensing nodes is formed between edge portions of the receiver electrodes and adjacent portions of the transmitter electrodes, wherein the length of the edge portions per sensing node is varied with the thickness of the cover panel so that the edge portion length per sensing node increases as the thickness increases, so as to provide part or substantially complete compensation for variation in node sensitivity across the sensor which would otherwise exist as a result of the varying thickness of the cover panel.