數位電視為家庭影音娛樂中心,如何讓不同年齡層的使用者都能快速上手日益複雜的數位電視系統。本研究探討數位電視系統兩種選單之操作性。首先透過文獻探討介面設計相關理論,並對現有影音產品介面進行分析,發現遙控裝置與使用介面依然複雜難以上手。 以數位電視使用情境為出發點,利用視覺搜尋及人機介面的理論進行新介面的使用性評估,本研究提出半圓形階層式選單搭配滾輪遙控器,企圖簡化數位電視的操作。此外,將半圓形階層式選單搭配焦點固定與焦點移動的方式,進行使用性的測試。 實驗依照焦點固定與焦點移動方式設計三種不同任務,每種任務各執行五次,進行任務操作與績效紀錄,並以SUS系統使用性問卷作與NASA-TLX心智負荷評量表進行訪談,本研究提出以下結論: (1) 操作半圓形階層選單,視覺焦點不需在遙控器與螢幕上來回移動,可降低使用者之心智負荷,尤其是中老年齡族群。 (2) 「焦點移動」式選單之操作績效較高;受測者認為「焦點移動」式選單較符合一般人使用習慣。 (3) 使用「焦點固定」選單耗費較多的時間操作移動的選項,增加心智負荷。
Digital TV has become home entertainment center. However, to allow users of different ages to quickly get started with increasingly complex digital TV has become an issue. the analysis of existing audio-visual products interface and remote control devices revealed that the complexity of the user interface is hard to get started. Apply real-life digital TV using scenarios for the new interface usability evaluation, using visual search and human-computer interfaces theory, This study proposes a stacked half-pie menu with a scrolling wheel remote control to simplify the operation of digital TV. Employing visual search theory, this study paired stacked half-pie menu with (1) stationary focus selection and (2) moving focus selection, and conducted usability tests. Firstly, three different tasks were designed to evaluate both stationary focus and moving focus on screen menu operation of stacked half-pie menu. Secondly, SUS(System Usability Scale) and NASA-TLX(National Aeronautics And Space Administration Task Load Index) scale were submitted to evaluate satisfaction and mental-workload. Three main conclusions are as follows: (1) Operating stacked half-pie menu on digital TV, users no longer need to switch their focus between television screen and the remote controller. This is especially can benefits aging population. (2) "Moving focus" on screen menu operation delivered higher performance; subjects considered "moving focus" complied with their experience. (3) "Stationary focus" on screen menu operation takes much time to complete the selection task and reported to increase mental workload.