通過良好的設計改善觸摸屏的性能

　　作為觸摸屏的日益成熟，他們變得更具挑戰性的設計。幸運的是，好的設計規則并沒有改變，而且有一些解決方案來幫助我們迎接挑戰。

　　人機界面（HMI）在經歷了近幾年的一場革命。機械的QWERTY鍵盤與鼠失寵被光滑的觸摸屏取代。人們只需考慮手機的演變，看看制造商如何在鍵盤拋棄的同時，匆忙推出更大更好的觸摸屏產品。

　　觸控已經使用多年，那么光鮮的應用。例如，觸摸功能的許多家用電器如微波爐、洗碗機的鍵盤很受歡迎，取代昂貴的和不可靠的機械鍵盤。觸摸屏在工業控制環境中被廣泛采用，因為它們非常適合通常遇到的惡劣操作環境。

　　These advantages aside， one of the main motivations for touch screen adoption is that mechanical parts wear out and break down with extended use. While keyboards and mice， for example， have proven to be relatively durable HMIs for computer systems， they do eventually break. Dirty， dusty， or humid environments increase the likelihood of early failure because particles and moisture can get into mechanical parts and accelerate wear.

　　Finally， keyboards and switches are hardly the most hygienic devices. While this may not be such a big problem for industrial or domestic environments， it‘s certainly a major issue in medical applications.

　　This article will take a look at capacitive touch sensing， the most popular technology for touch screens in use today， and will describe design techniques that improve the user experience by improving response and minimizing false touches， whereby the device reacts to a finger in close proximity to a sensor button rather than a deliberate touch by the user.