近年，智慧行動裝置已經相當普及，多數的行動裝置都配備著觸控螢幕作為I/O介面與使用者進行互動，而在智慧型動裝置上的應用程式也針對觸控螢幕的遭作模式進行優化，並著力於發展讓使用者可以自然且方便使用應用介面，例如虛擬按鍵及手勢等；其中虛擬按鍵更廣被維使用，讓使用者進行功能選擇、轉換分頁等功能。在四吋以內的小螢幕智慧裝置上，使用者都可以用單手的方式進行操作，並不會有點按不便的問題產生。
但近年隨著大螢幕風潮的興起，手持行動裝置的螢幕已經逐漸突破四吋的門檻，例如 Samsung Note, ASUS Phone Pad 與iPhone 6 Plus等，在上述的大螢幕手持裝置上，多數的使用者需要使用雙手來進行操控；但在特定情況下，使用者並沒有辦法使用雙手點按螢幕上的功能按鍵，進而造成使用上的不便。
在這篇論文中，我們針對上述的問題提出了兩種創新的使用者介面，讓使用者可以透過單手操作的方式在大螢幕手持裝置上進行功能選按；在實驗結果中，我們透過客觀的數據以及使用者評估來展示所提出的單手操作介面是方便且有效的。

A mobile device is a pocket-sized computing device with a touchscreen. Using a touchscreen as an Input/Output device, many applications, known as Apps, have been developed to interact with humans in a way as natural as possible. In most cases, the user interactive interface for mobile applications is designed to allow interaction with users via multiple buttons on a touchscreen. Conventionally, to press a button on a touchscreen, a user uses one hand when the mobile device is small. However, recently, touchscreens for mobile devices have become larger than those of traditional hand-held devices. The Samsung Note, the ASUS Phone Pad and the iPhone 6 plus are examples. Because manufactures have enlarged the size of mobile devices, users use an entire hand to interact with applications, which is difficult. In addition, in some situations, users cannot use a pair of hands to interact with applications. To resolve this issue, using the Android system, this study proposes two novel user interactive interfaces, which guarantee that users can interact with applications using one hand, even if the touchscreen is large. In the demonstration, one-handed operation of the mobile device is shown to be easy.

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