- 學位論文
基於屏蔽策略改善電容式觸控感測之靈敏度
Based on Shielding Strategy Improving Sensitivity of Capacitive Touch Sensing
摘要
因為電容式觸控概念具有直覺式的介面操作與幾乎沒有使用壽命的限制，因此，其相關裝置已廣泛的被應用在各種設備中。電容式觸控感測器應用有兩項主要限制：在小感測面積的條件下使用會存在感測靈敏度不佳和在機械構造厚的設計中有不良感測穿透性的限制。因此，本論文提出一個使用在電容式觸控技術中的屏蔽策略來提高感測靈敏度與改善穿透性之兩項限制。在相同測試條件下和原型比較，我們所提的方法能提升約2.35倍的感測能力和改善約2.5倍訊噪比。因此，和一個具有50 mm2的感測點與上蓋厚度為4 mm的實驗裝置比較效能，我們的方法能夠讓感測點面積減少為7 mm2與上蓋為2 mm；但是兩者有相同的感測能力與訊噪比。因此，我們的所提出的電容式觸控的技術可以滿足在有限空間及上蓋厚度限制條件下的各種應用。我們的設計不但可以擴大市場應用的範圍，而且可以解決設計上的限制。
並列摘要
Since the capacitive touch concept owns the intuitional interface operations and almost without service-life limitation, its related devices have been widely used in various applications. There are 2 major limitations of the capacitive touch sensor for applications. The sensitivity will be bad under the smaller sensing area and the poor sensing penetration under the design of the thicker mechanical structure. Hence, we propose the shielding strategy of capacitive touch technology for improving the two limitations of the sensing sensitivity and penetration in this study. Based on the same tested conditions, our proposed can improve the sensing sensitivity upto about 235% and the Signal Noise Ratio (SNR) upto about 250% than the original model. Hence, compared with the experiment device with 50 mm2 sensing area and 4 mm thick cover, our proposed approach with same performance can reduce 50 mm2 down to 7 mm2 and 4 mm down to 2 mm. Therefore, our proposed capacitive touch technology can be met the various applications under the limitations of the smaller sensing space and thicker cover conditions. Our design not only can expand the applied range of the markets but also can solve the design limitations.