Acoustic touch sensor

摘要

There is provided a touch sensor comprising a substrate capable of propagating acoustic waves. The substrate includes a first surface having a touch sensitive region and a first sidewall intersecting the first surface along a first edge. The first edge is configured to propagate a first acoustic wave along the first edge, and the first surface is configured to propagate a second acoustic wave across the touch sensitive region, the second acoustic wave being based on the first acoustic wave. The touch sensor further comprises a wave converter for converting the first acoustic wave to the second acoustic wave.