公开(公告)号：US10698546B1

公开(公告)日：2020-06-30

申请号：US16228037

申请日：2018-12-20

Applicant: QUALCOMM Incorporated

Inventor： Richard Stacy Withers ,  David Johnson ,  Hrishikesh Panchawagh

IPC: G06F3/044 ,  G06F3/041 ,  G06F3/047

Abstract: Methods, systems, and devices for detection of a protective cover film on a capacitive touch screen are described. A device may include a capacitive touch screen having a surface and a sensor grid underneath the surface having a set of conductive columns and a set of conductive rows. The device may measure a mutual capacitance between a subset of conductive columns or a subset of conductive rows associated with a sensor grid, and compare the measured mutual capacitance between the subset of conductive columns or the subset of conductive rows to a baseline mutual capacitance associated with the set of conductive columns and the set of conductive rows. According to the comparison, the device may determine a presence of a protective layer in contact with the surface of the capacitive touch screen, and adjust an operating characteristic of the sensor grid.

公开(公告)号：US10478858B2

公开(公告)日：2019-11-19

申请号：US14569256

申请日：2014-12-12

Applicant: QUALCOMM Incorporated

Inventor： Jon Bradley Lasiter ,  Ravindra Vaman Shenoy ,  Evgeni Petrovich Gousev ,  Hrishikesh Panchawagh ,  David William Burns ,  Nai-Kuei Kuo ,  Jonathan Charles Griffiths ,  Suryaprakash Ganti

IPC: H01L41/31 ,  B06B1/06 ,  G10K9/125 ,  G06F3/041 ,  G06F3/043 ,  G06K9/00

Abstract: A piezoelectric micromechanical ultrasonic transducer (PMUT) includes a multilayer stack disposed on a substrate. The multilayer stack may include an anchor structure disposed over the substrate, a piezoelectric layer stack disposed over the anchor structure, and a mechanical layer disposed proximate to the piezoelectric layer stack. The piezoelectric layer stack may be disposed over a cavity. The mechanical layer may seal the cavity and, together with the piezoelectric layer stack, is supported by the anchor structure and forms a membrane over the cavity, the membrane being configured to undergo one or both of flexural motion and vibration when the PMUT receives or transmits ultrasonic signals.