智慧型手機螢幕尺寸近年來有逐漸增大的趨勢，增加行動中使用單手拇指輸入的困難，然現今之文字輸入介面卻並未針對單手拇指操作進行最佳化設計。本研究針對單手拇指操作智慧型手機發展新式滑移式鍵盤(Sliding Keyboard)，新式滑移式鍵盤設計之原則為縮減輸入區域、增加輸入時之穩定度、降低輸入錯誤率及提供個別使用者客製化的鍵盤，而且考慮人因工程的原則，讓操作更符合生物力學，以解決使用既有輸入法常見的問題，如(1)單手拇指操作螢幕尺寸較大的手機，使手機會大幅度旋轉，容易造成錯誤率提高以及手部傷害；(2)因輸入區域受限於手機螢幕尺寸，致使按鍵面積遭到壓縮，使得輸入績效不佳及(3)現有之輸入法的設計無法完全符合使用者之手型、指長的需求。
本研究為驗證新式滑移式鍵盤(Sliding Keyboard)開發的結果符合設計目標進行一系列實驗，分別評估主、客觀之輸入績效、疲勞度與偏好，並與現有之輸入法(Qwerty與Dvorak)在不同螢幕大小與操作姿勢的狀況下相比較。實驗結果顯示：雖有部分受測者因習慣及熟悉度等因素對Sliding Keyboard有些微的不適應，但統計分析結果顯示，雖然在綜合分數(輸入速度與正確率的綜合評價指標)方面新式滑移式鍵盤輸入法不如Qwerty鍵盤，但遠勝Dvorak鍵盤；而新式滑移式鍵盤輸入正確率不論用任何姿勢皆高過Qwerty鍵盤，並且在大部分的姿勢下也皆優於Dvorak鍵盤。此外新式滑移式鍵盤穩定度明顯優於Qwerty鍵盤並與Dvorak鍵盤無顯著差異，輸入速度於特定條件下更不亞於Qwerty鍵盤。故本研究開發之新式滑移式鍵盤可在QWERTY鍵盤產生輸入困難的條件下，作為有效的替代性鍵盤，提升使用者操作手機的績效。

The screen size of smartphones is gradually increasing in recent years and using thumb single-handed in mobile situation becomes more difficult. However, entry interfaces today have not been improved and redesigned for single-handed thumb operations. Therefore, this study focused on developing a new entry interface for smartphone, Sliding keyboard, to optimize such operations. The sliding keyboard is designed to reduce the input region, to increase the stability during data entry, to reduce errors and to customize keyboards for different users based on their anthropometric features. The sliding keyboard also considers human factors engineering to make the operation more comfortable biomechanically. The design can solve several common problems for popular input methods, for example, difficulty in using mobile phone by single-handed thumb operations on a large screen, high error rates caused by substantial rotations which may possibly raise the risk of hand/wrist injuries; the compressed input area that produces poor user performance, and the insufficient design of the existing input methods to fit the users’ hands and fingers.
To validate the design of the sliding keyboard, a series of experiment were conducted. The experiment compared the sliding keyboard with the existing input methods (QWERTY and Dvorak) on subjective and objective performance, fatigue and preference for the input methods on screens of two sizes in four operation postures. The experimental results showed that, although some subjects were not accustomed to the sliding keyboard, the statistical analysis indicated that the Sliding Keyboard is far better than Dvorak keyboard in overall score while the QWERTY keyboard is the best in the overall score (a composite evaluation of the input speed and accuracy). The error rate of the sliding keyboard regardless of positions was lower than that of the QWERTY keyboard, and were better than the Dvorak in most postures. The stability assessment of the sliding keyboard was superior to the QWERTY keyboard, and also steadier than the Dvorak keyboard. The speed of the sliding keyboard was nearly equal to that of the QWERTY keyboard in certain conditions. Therefore, the developed sliding keyboard can be an effective alternative in conditions where the QWERTY keyboard is difficult to use and enhance the performance of users on mobile phones.

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