Patent ID: 8970547
Filing Date: 2015-03-03
Classification: G06F

Abstract:
1. A processing system for a display device having an integrated capacitive sensing device, the display device comprising a plurality of common electrodes configured for display updating and capacitive sensing, the processing system comprising: a driver module comprising driver circuitry configured for coupling to the plurality of common electrodes and configured to drive the plurality of common electrodes for display updating and capacitive sensing; wherein the driver module is configured to drive the plurality of common electrodes for capacitive sensing during a first capacitive sensing period of a first display frame and a second capacitive sensing period, wherein the first capacitive sensing period comprises a first plurality of non-display update periods, wherein the driver module is further configured to operate the plurality of common electrodes for interference sensing; a receiver module configured to receive first resulting signals during the first capacitive sensing period, second resulting signals during the second capacitive sensing period, and a third resulting signal when the plurality of common electrodes are operated for interference sensing; and a determination module configured to acquire a first capacitive image based on the first resulting signals, a second capacitive image based on the second resulting signals, and an interference measurement based on the third resulting signals; wherein the determination module is configured to determine positional information based on the first capacitive image responsive to the interference measurement being less than a threshold value; and wherein the determination module is configured to determine positional information based on the second capacitive image responsive to the interference measurement exceeding the threshold value.