US Patent 9128577 Hybrid capacitive touch system design and method

In one embodiment, a system includes first lines of conductive material and a touch sensor comprising second and third lines of conductive material inside and outside the touch sensor. The first lines of conductive material are outside the touch sensor and disposed between second lines of conductive material outside the touch sensor and the third lines of conductive material outside the touch sensor. The system further includes logic that is configured when executed to apply a ground signal to the first lines of conductive material and sense touch inputs at the touch sensor using mutual-capacitive touch sensing in response to determining to operate in a mutual-capacitive mode of operation, and apply a voltage signal to the first lines of conductive material and sense touch inputs at the touch sensor using self-capacitive touch sensing in response to determining to operate in a self-capacitive mode of operation.