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http://dx.doi.org/10.5573/ieie.2015.52.4.071

Dual Sensing with Voltage Shifting Scheme for High Sensitivity Touch Screen Detection  

Seo, Incheol (School of Electrical Engineering and Computer Science, Chungbuk National University)
Kim, HyungWon (School of Electrical Engineering and Computer Science, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.4, 2015 , pp. 71-79 More about this Journal
Abstract
This paper proposes a new touch screen sensing method that improves the drawback of conventional single-line sensing methods for mutual capacitance touch screen panels (TSPs). It introduces a dual sensing and voltage shifting method, which reduces the ambient noise effectively and enhances the touch signal strength. The dual sensing scheme reduces the detection time by doubling the integration speed using both edges of excitation pulse signals. The voltage shifting method enhances the signal-to-noise ratio (SNR) by increasing the voltage range of integrations, and maximizing the ADC's input dynamic range. Simulation and experimental results using a commercial 23" large touch screen show an SNR performance of 43dB and a scan rate 2 times faster than conventional schemes - key properties suited for a large touch screen panels. We implemented the proposed method into a TSP controller chip using Magnachip's CMOS 0.18um process.
Keywords
Projected capacitive touch screen; dual sensing; voltage shifting; integrator;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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