US 11,868,555 B2
Low latency input object detection under low ground mass condition
Kirk Hargreaves, Mountain View, CA (US); Guozhong Shen, San Jose, CA (US); Ching-Hsung Wang, San Jose, CA (US); and Guan-Hua Cao, Shanghai (CN)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Jan. 31, 2023, as Appl. No. 18/104,248.
Application 18/104,248 is a continuation of application No. 17/522,679, filed on Nov. 9, 2021, granted, now 11,592,925.
Prior Publication US 2023/0176679 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0416 (2013.01) [G06F 3/0441 (2019.05); G06F 3/04186 (2019.05); G06F 3/0442 (2019.05); G06F 2203/04108 (2013.01); G06F 2203/04114 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A processing system configured to detect an input object proximate the processing system comprising:
sensor circuitry configured to:
determine that the processing system is in a low ground mass (LGM) state,
determine an object having a size exceeding the input object is proximate to a plurality of sensor electrodes, the plurality of sensor electrodes arranged in substantially orthogonal rows and columns and configured to transmit uplink signals to the input object; and
in response to the object being determined proximate to the plurality of sensor electrodes and the processing system in the LGM state,
drive a first group of the plurality of sensor electrodes with one of an inverted modulated signal or a non-inverted modulated signal, and
drive a second group of the plurality of sensor electrodes with a static non-modulated DC voltage, wherein the first group of the plurality of sensor electrodes comprises at least one row of sensor electrodes that intersect a location where the object is proximate the plurality of sensor electrodes.