Capacitive touch sensing is used in touchscreens to enable the use of a finger as a pointing device. The two-dimensional coordinates of a touch are sensed by a two-dimensional mutual capacitance grid. However, due to their relatively dense routing requirements, two-dimensional mutual capacitance grids are not suitable for space-constrained interactive surfaces such as watch straps. This disclosure describes the use of linear, one-dimensional capacitive arrays with complementary capacitive gradients to achieve continuous tracking of two-dimensional user interactions. The described techniques can be used to create touch-sensitive regions of electronic devices generally and, particularly, in situations of space constraint, e.g., in smartwatches, in interactive watch bands, etc.

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This work is licensed under a Creative Commons Attribution 4.0 License.