US 12,072,741 B1
Capacitive detection of fold angle for foldable devices
Tom Vandermeijden, San Jose, CA (US); and Guozhong Shen, Fremont, CA (US)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Feb. 22, 2023, as Appl. No. 18/172,681.
Int. Cl. G06F 1/16 (2006.01); G01B 7/30 (2006.01); G06F 3/044 (2006.01)
CPC G06F 1/1677 (2013.01) [G01B 7/30 (2013.01); G06F 1/1616 (2013.01); G06F 3/0446 (2019.05)] 21 Claims
OG exemplary drawing
 
1. A system for determining a fold angle of a foldable device, comprising:
a plurality of electrodes; and
a processing system, configured to:
determine a first detected temperature at a first time;
obtain, via a subset of the plurality of electrodes, baseline reference absolute capacitance measurements associated with the first detected temperature and associated with a known fold angle of the foldable device;
determine a second detected temperature at a second time later than the first time;
obtain, via the subset of the plurality of electrodes, absolute capacitance measurements associated with the second detected temperature at the second time;
based on the second detected temperature being different from the first detected temperature, generate updated baseline reference absolute capacitance measurements based on the obtained capacitive measurements associated with the second detected temperature at the second time;
obtain, via the subset of the plurality of electrodes, absolute capacitance measurements at a third time later than the second time; and
determine the fold angle of the foldable device based on the absolute capacitance measurements obtained at the third time and the updated baseline reference absolute capacitance measurements.