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http://dx.doi.org/10.7236/JIWIT.2012.12.6.279

Design and Implementation of Low Power Touch Screen Controller for Mobile Devices  

Park, Sang-Bong (Dept. Information&Communication, Semyung University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.12, no.6, 2012 , pp. 279-283 More about this Journal
Abstract
In is paper, we design and implement the low power, high speed touch screen controller that calculates and outputs the coordinate of touch point on the touch screen of mobile devices. The system clock is 10HMz, the number of input channels is 21, standby current is $20{\mu}A$, dynamic range of input is 140pF~400pF and the response time is 0.1ms/frame. It contains the power management unit for low power, automatic impedance calibration unit in order to adapt to humidity, temperature and evaluation board, adjacent key and pattern interference suppression unit, serial interface unit of I2C and SPI. The function and performance is verified by using FPGA and $0.18{\mu}m$ CMOS standard process. The implemented touch screen is designed for using in the double layer ITO(Indium Thin Oxide) module with diamond pattern and single layer ITO module for cost-effective which are applied to mobile phone or smart remote controller.
Keywords
Touch screen controller; Single layer ITO; Double layer ITO; Automatic impedance calibration; Adjacent key and pattern interface suppression;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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