A touch controller using differential sensing method for on-cell capacitive touch screen panel systems

Author

Ik-Seok Yang ; Oh-Kyong Kwon

Author_Institution

Dept. of Electron. Eng., Hanyang Univ. in Seoul, Seoul, South Korea

Volume

57

Issue

3

fYear

2011

fDate

8/1/2011 12:00:00 AM

Firstpage

1027

Lastpage

1032

Abstract

A touch controller is proposed for on-cell capacitive touch screen panel systems. The proposed IC adopts the differential sensing method to enhance the dynamic range of sensing voltage and to be robust to display noise. The measurement results show that the maximum reporting rate, jitter tolerance, and signal-to-noise ratio (SNR) are 140 Hz, ±0.3 mm, and 12 dB, respectively, when evaluated with a 13.3-inch wide extended graphics array (WXGA) liquid crystal display (LCD) panel with the on-cell touch screen. The proposed IC fabricated via 0.35 μm CMOS process technology occupies a silicon area of 4 mm × 5 mm and consumes a power of 19 mW when the supply voltage is 3.3 V.

Keywords

CMOS integrated circuits; capacitive sensors; liquid crystal displays; screens (display); tactile sensors; CMOS process technology; SNR; WXGA LCD panel; differential sensing method; display noise; dynamic range enhancement; frequency 140 Hz; jitter tolerance; maximum reporting rate; noise figure 12 dB; on-cell capacitive touch screen panel system; power 19 mW; sensing voltage; signal-to-noise ratio; size 0.35 mum; size 13.3 inch; touch controller; voltage 3.3 V; wide extended graphics array liquid crystal display panel; Capacitance; Capacitance measurement; Dynamic range; Electrodes; Integrated circuits; Noise; Sensors; On-cell capacitive touch screen panel; differential sensing method; mutualcapacitance; readout circuit;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2011.6018851

Filename

6018851