Small-Area and High-Accuracy Calibration Technique for Sensing Capacitor in the Touch Screen Panel
In this paper, a small-area and high-accuracy calibration technique for sensing capacitor in the touch screen panel is proposed. It uses 10-bit C-2C structure in calibration analog-to-digital converter (ADC) to get higher accuracy and small area just in one frame time. By boosting and comparing, the varied outputs of the charge amplifier are held at a reference voltage. Compared to previous calibration technique that adjusts feedback capacitor of the charge amplifier, it has advantage of faster speed, smaller area and higher accuracy. Simulation result shows that 10％ variation of the sensing capacitance causes the variation of the output of charge amplifier less than 3mV in 3.5 inch touch screen panel.
Touch screen panel projected capacitive sensor capacitance variation calibration
Wen-Hai Cui Tong-Hun Hwang Min-Seok Shin Ik-Seok Yang Oh-Kyong Kwon
Division of Electrical and Computer Engineering, Hanyang University, Seoul, Korea
国际会议
The 11th Asian Symposium on Information Display(ASID09)(第11届亚洲信息显示会议)
广州
英文
181-184
2009-10-07（万方平台首次上网日期，不代表论文的发表时间）