US 11,953,400 B2
Input device including improved pressure sensing unit design
Che-Chia Hsu, Hsin-Chu (TW); Yu-Han Chen, Hsin-Chu (TW); and Chi-Chieh Liao, Hsin-Chu (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu (TW)
Filed by PIXART IMAGING INC., Hsin-Chu (TW)
Filed on May 2, 2023, as Appl. No. 18/142,055.
Application 18/142,055 is a continuation of application No. 17/233,806, filed on Apr. 19, 2021, granted, now 11,674,862.
Prior Publication US 2023/0266191 A1, Aug. 24, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01L 9/12 (2006.01); G01L 9/00 (2006.01)
CPC G01L 9/12 (2013.01) [G01L 9/0005 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A pressure sensing unit for detecting pressing events comprising:
a membrane having a first surface and a second surface opposite to the first surface; and
a pressure sensing pad group including a first pressure sensing pad, a second pressure sensing pad, and a ground pad that are spaced apart from one another;
wherein the ground pad and one among the first pressure sensing pad and the second pressure sensing pad are located at the first surface of the membrane, another one among the first pressure sensing pad and the second pressure sensing pad is located at the second surface of the membrane, and an orthographic projection of the ground pad projected onto a reference plane is located between orthographic projections of the first pressure sensing pad and the second pressure sensing pad that are projected onto the reference plane.