MODULATED BACK PLATE FOR CAPACITIVE SENSING

摘要

Embodiments described herein include an input device comprising a display device having an integrated capacitive sensing device, a processing system, and a method for detecting presence of an input object. In each of these embodiments, a modulation source provides modulation signals between a back plate and a system ground of the input device. Other embodiments include a display device having a capacitive sensing device, a processing system and a method for detecting presence of an input object using a capacitive sensing device, wherein the capacitive sensing device includes a matrix of discrete sensor electrodes.

主权项

1. An input device comprising a display device having an integrated capacitive sensing device, the input device comprising;
a system ground; a conductive back plate configured to be coupled to an input object; a plurality of sensor electrodes; and a processing system coupled to the conductive back plate and the plurality of sensor electrodes, the processing system configured to:
drive modulation signals onto the conductive back plate; andreceive resulting signals with at least one of the plurality of sensor electrodes, the resulting signals comprising effects corresponding to the modulation signals;wherein the modulation signals cause the conductive back plate and the input object to be modulated with respect to system ground.