A Context-Aware Readout System for Sparse Touch Sensing Array Using Ultra-low-power Always-on Event Detection

Increasing demand for larger touch screen panels (TSPs) places more energy burden to mobile systems with conventional sensing methods. To mitigate this problem, taking advantage of the touch event sparsity, this paper proposes a novel TSP readout system that can obtain huge energy saving by turning...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2023-09, Vol.70 (9), p.1-1
Main Authors: Roh, Hyeri, Choi, Woo-Seok
Format: Article
Language:English
Subjects:
always-on event detection
Capacitive touch sensor
compressed sensing
Context
context-aware system
Event detection
Power management
Read out systems
sensor array
Sensor arrays
Sensor systems
Sensors
Signal to noise ratio
sparse event detection
Tactile sensors
Time division multiplexing
Touch screens
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Summary:Increasing demand for larger touch screen panels (TSPs) places more energy burden to mobile systems with conventional sensing methods. To mitigate this problem, taking advantage of the touch event sparsity, this paper proposes a novel TSP readout system that can obtain huge energy saving by turning off the readout circuits when none of the sensors are activated. To this end, a novel ultra-low-power always-on event and region of interest detection based on lightweight compressed sensing is proposed. Exploiting the proposed event detector, the context-aware TSP readout system, which can improve the energy efficiency by up to 42×, is presented.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2023.3276063