A Noise-Immune High-Speed Readout Circuit for In-Cell Touch Screen Panels

Delta-Integration, a novel readout method, is introduced in an effort to solve the noise and speed issues impeding the performance of in-cell touch screen panels. In the proposed method, a differential sensing scheme effectively cancels common noise components and locally occurring noise is spatiall...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2013-07, Vol.60 (7), p.1800-1809
Main Authors: Yang, Jun-Hyeok, Jung, Seung-Chul, Son, Young-Suk, Ryu, Seung-Tak, Cho, Gyu-Hyeong
Format: Article
Language:English
Subjects:
Capacitance
Capacitors
Charge amplifier
delta-integration
Feedback amplifier
in-cell
Noise
Radiation detectors
Tactile sensors
touch screen panel
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Summary:Delta-Integration, a novel readout method, is introduced in an effort to solve the noise and speed issues impeding the performance of in-cell touch screen panels. In the proposed method, a differential sensing scheme effectively cancels common noise components and locally occurring noise is spatially low-pass filtered. Due to the consequently enhanced Signal- to-Noise Ratio, the proposed scheme is simply implemented by a comparator and a counter only in place of a complex ADC. The comparator is designed to have a `dead-zone' for noise-immune characteristics. In addition, a new global charge amplifier that has much wider bandwidth and higher current-driving capability than the conventional one is proposed for high speed operation. The prototype chip consumes a static power of 1.15 mW and the total chip area without panel loads is 2.5 mm 2 .
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2012.2230494