SIMULTANEOUS DISPLAY UPDATING AND CAPACITIVE SENSING FOR AN INTEGRATED DEVICE

摘要

Embodiments of the invention generally provide an input device with an integrated display that drives a capacitance sensing signal on a sensor electrode in parallel with driving a display signal onto a display electrode. To mitigate the interference between the two signals, the input device synchronizes the frequency of the capacitance sensing signal to a line rate used when performing display updating—i.e., the time period used by the integrated display to update a row of pixels. In one example, the capacitance sensing cycles includes a plurality of sensing cycles. The time period of the sensing cycles may be synchronized with the line rate. In addition, in one embodiment, the input device may phase align the capacitance sensing signal with a periodic noise event in the display signal such as a voltage transition, charge share event, and the like.

主权项

1. An input device comprising:
a plurality of display electrodes; a plurality of sensor electrodes; and a processing system coupled to the plurality of sensor and display electrodes, the processing system is configured to:
drive a capacitive sensing signal onto at least one of the plurality of sensor electrodes; anddrive a display signal onto at least one of the plurality of display electrodes for updating the display, wherein the capacitive sensing signal and the display signal are driven in parallel for at least some period of time, and wherein a frequency of the capacitive sensing signal is synchronized to a line rate used by the display module when updating the display.