A Highly Area-Efficient Controller for Capacitive Touch Screen Panel Systems

被引：75
作者：
Hwang, Tong-Hun [1 ]
Cui, Wen-Hai [1 ]
Yang, Ik-Seok [1 ]
Kwon, Oh-Kyong [1 ,2 ,3 ]
机构：
[1] Hanyang Univ, Dept Elect Engn, Seoul 133791, South Korea
[2] Hanyang Univ, Div Elect & Comp Engn, Seoul 133791, South Korea
[3] Hanyang Univ, Coll Engn, Seoul 133791, South Korea
来源：
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS | 2010年 / 56卷 / 02期
关键词：
Projected capacitive touch screen panel; compensation technique; mutual capacitance; successive approximation register analog-to-digital converter;
D O I：
10.1109/TCE.2010.5506047
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：
In this paper, a highly area-efficient controller for capacitive touch screen panels (TSPs) is proposed. The proposed controller uses a 10-bit successive approximation register analog-to-digital converter (SAR ADC) with an adder to compensate for the capacitance variation in the TSP and for the offset voltage variation in the charge amplifier of the sensing circuit. By using the proposed compensation method, the area of the controller can be reduced by 90.3% of the area of the conventional controllers. The measurement results showed that the signal-to-noise ratio (SNR) of the controller increases from 12.5 to 21.3 dB after compensation. Also, its spatial jitter decreases from +1.5 to +0.46 mm, which is 7% of the sensor pitch of 8 mm.(1)
引用
收藏
页码：1115 / 1122
页数：8
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