Recognition of Bed Postures Using Mutual Capacitance Sensing

2014 ◽  
pp. 51-66 ◽  
Author(s):  
Silvia Rus ◽  
Tobias Grosse-Puppendahl ◽  
Arjan Kuijper
Keyword(s):  
Mutual Capacitance

scholarly journals A Mutual Capacitance Touch Readout IC with Synchronization in Touch and Mobile Display Driving for High Refresh Rate AMOLED Panels

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 922
Author(s):  
Seunghoon Ko
Keyword(s):  
System Architecture ◽  
Noise Suppression ◽  
Touch Screen ◽  
Horizontal Line ◽  
Time Sharing ◽  
Refresh Rate ◽  
Front End ◽  
Scan Rate ◽  
Mutual Capacitance ◽  
Analog Voltage

This paper presents a mutual capacitance touch readout IC architecture for 120 Hz high-refresh-rate AMOLED displays. In high-refresh-rate AMOLED panels, whole pixels in a horizontal line should be updated without any time-sharing with each other, leading to an amplified display noise on touch screen panel (TSP) electrodes. The proposed system architecture mitigates severe display noise by synchronizing the driving for the TSP and AMOLED pixel circuits. The proposed differential sensing technique, which is based on noise suppression in reference to mutual capacitance channels, minimizes common-mode display noise. In the front-end circuit, intrinsic circuit offset is cancelled by a chopping scheme, which correlates to the phase of the driving signals in the TSP driver and operating clocks of the front-end. Operating at a 120 Hz scan-rate, it reduces display noise by more than 11.6 dB when compared with the conventional single-ended TSP sensing method. With a built-in 130-nm CMOS, a prototype IC occupies an area of 8.02 mm2 while consuming 6.4-mW power from a 3.3 V analog voltage supply.

scholarly journals Numerical Simulation of Mutual Capacitance Touch Screens for Ungrounded Objects

2017 ◽  
Vol 17 (16) ◽  
pp. 5143-5152 ◽  
Author(s):  
Christian Bjorge Thoresen ◽  
Ulrik Hanke
Keyword(s):  
Numerical Simulation ◽  
Mutual Capacitance ◽  
Touch Screens

A Wide frequency range circuit for measuring mutual capacitance with application to monitoring of metal fill profile

2008 ◽  
Author(s):  
W. A. Deabes ◽  
M. A. Abdelrahman ◽  
Conard F. Murray ◽  
P. K. Rajan ◽  
Justin L. Russell
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range ◽  
Mutual Capacitance
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