OFDM and TDM Based Sensing Method for Large Projected Mutual-Capacitance Touch Screens

被引：0
|
作者：
Mohamed, M. G. A. [1 ]
Ragheb, A. N. [1 ]
Hassan, Hossam [1 ]
Kim, HyungWon [1 ]
机构：
[1] Chungbuk Natl Univ, Sch Elect Engn & Comp Sci, Cheongju, Chungcheongbuk, South Korea
来源：
2016 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS (ICCE) | 2016年
关键词：
CONTROLLER;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper presents a new technique for reading out projected mutual capacitance touch screen panels. It models touch screen panel as a communication system. Orthogonal frequency division multiplexing (OFDM) is used along with time division multiplexing (TDM) to read out all channels of touch screen panels. Different carrier frequencies are applied to touch screen panel concurrently using OFDM, while the sensing lines are sensed sequentially using TDM. The proposed technique ensures a high frame scan rate by using simultaneous driving signals, and it provides high signal to noise ratio (SNR) by avoiding frequency band with high noise power. Simulation results demonstrate a SNR improvement of 8.2 dB by selecting adequate carrier frequencies.
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页数：4
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