Electric Hum Signal Readout Circuit for Touch Screen Panel Applications | IEEE Journals & Magazine | IEEE Xplore

Electric Hum Signal Readout Circuit for Touch Screen Panel Applications


Abstract:

This paper presents a new touch sensing mechanism that detects different signals on a touch panel generated by an electric field formed from household power. Without requ...Show More

Abstract:

This paper presents a new touch sensing mechanism that detects different signals on a touch panel generated by an electric field formed from household power. Without requiring complicated transmitter and receiver circuits, a 16-channel front-end sensor and shared readout circuits are proposed to realize the new touch-sensing mechanism. This touch-sensing technique can be applied on the appliance control panel to detect the operation control. The signal readout circuit is implemented in a 0.18-μm CMOS process, which occupied an area of 2.64 mm2. The proposed sensing technique achieves 46.5-dB signal-to-noise ratios with finger touch. With battery power supply of 1.8 V and 2.5 V, total power consumption of the proposed readout circuit is measured as just 2 mW.
Published in: Journal of Display Technology ( Volume: 12, Issue: 11, November 2016)
Page(s): 1444 - 1450
Date of Publication: 08 September 2016

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I. Introduction

The use of sensing in interfaces between electronic systems and users has become more prevalent. A touch sensitive device enables users to perform various functions by touching the touch sensor panel with their finger. A common use of touch sensing technology is capacitive sensing [1] –[8]. A touch sensitive device can detect the touching location of a user's finger only when the user's finger touches the sensor panel. As presented in previous research [9], some touch sensitive devices can also recognize a floating event. When an object is near but not touching the touch sensor panel, the touch sensitive device can process the floating event in a manner similar to that of a touch event. Because of the sensing mechanism and signal strength, traditional touch sensitive devices do not sense floating events easily. The other previous work [10] has already demonstrated a practical solution to this problem by forming a specific electric field. The electric field is complete when not interrupted by the entrance of an object; however, the electric field is disturbed and broken when an object enters it. The major methodology of the floating sensing is similar to traditional wireless communications. However, its drawback is its large power consumption and it would face some electromagnetic interference issue.

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