Corrosion mitigation for metal traces

摘要

Processes for manufacturing touch sensors with one or more guard traces to reduce the effect of moisture damage are provided. One example process can include forming one or more guard traces between an edge of the touch sensor and the metal traces that route the drive and sense lines to bond pads. The one or more guard traces can be uncoupled from the drive lines and sense lines to protect the inner metal traces from moisture damage. In some examples, ends of the one or more guard traces can be coupled to ground by copper. In other examples, ends of the one or more guard traces can be coupled to ground by indium tin oxide or the one or more guard traces can be coupled to ground by a strip of indium tin oxide. In yet other examples, the guard trace can be floating (e.g., not coupled to ground).

主权项

1. A touch sensor comprising:
a plurality of sense lines; a plurality of drive lines; one or more bond pads; a plurality of metal traces that couple together the one or more bond pads with the plurality of sense lines and the plurality of drive lines; and a guard trace positioned between edges of the touch sensor and the plurality of conductive traces, wherein the guard trace is coupled to a sense line of the plurality of sense lines or a drive line of the plurality of drive lines, and wherein the guard trace is coupled to drive circuitry or sense circuitry operable to detect an open circuit in the guard trace.