Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications

Tzu Ming Wang; Ming Dou Ker

doi:10.1109/JDT.2010.2050577

Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications

Tzu Ming Wang, Ming Dou Ker

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-µm low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.

Original language	English
Pages (from-to)	290-297
Number of pages	8
Journal	IEEE/OSA Journal of Display Technology
Volume	6
Issue number	8
DOIs	https://doi.org/10.1109/JDT.2010.2050577
State	Published - 1 Aug 2010

Keywords

Low temperature poly-silicon (LTPS)
readout circuit
system-on-panel (SOP)
touch panel

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10.1109/JDT.2010.2050577

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title = "Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications",

abstract = "A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-µm low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.",

keywords = "Low temperature poly-silicon (LTPS), readout circuit, system-on-panel (SOP), touch panel",

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N2 - A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-µm low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.

AB - A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-µm low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.

KW - Low temperature poly-silicon (LTPS)

KW - readout circuit

KW - system-on-panel (SOP)

KW - touch panel

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JO - IEEE/OSA Journal of Display Technology

JF - IEEE/OSA Journal of Display Technology

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ER -

Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications

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