隨著數位化影像科技的進步與普及，觀賞與分享影像之方式亦將隨之改變，數位相框被預期將取代傳統相框與相簿，成為家庭中分享彼此回憶與經歷之方式之一。由於傳統相框與相簿被廣泛採用，故數位相框產品並非針對特定族群所設計，其預期之使用對象包含社會各階層與年齡層，其中亦包含日漸成長之中高齡消費族群。本研究之目的在探討數位相框使用介面：(1)符合中高齡族群使用者心智模式之介面設計特點；(2)中高齡族群使用數位相框介面時可能遭遇之問題，期能建構未來相關產品使用介面之設計原則。
本研究之實驗分為二階段進行，第一階段實驗以市面上三款具代表性之數位相框產品進行任務操作，並邀請年輕族群(小於45歲)與中高齡族群(45歲以上)參與測試，以了解不同年齡層之使用者於操作產品介面時可能遭遇之問題與意見。本階段之實驗結論有：(1)中高齡族群需要更多的協助；(2)避免過於繁複之選單設計；(3)所有功能皆應給予適當之提示；(4)按鍵配置應合乎邏輯；(5)圖形介面應輔以文字說明。
第二階段實驗則為數位相框模擬介面實驗，由第一階段實驗之結論設定本階段實驗設計之實驗變數為「按鍵功能提示」與「動態回饋」，實驗採3(按鍵功能提示)*2(動態回饋)雙因子實驗設計，共計六組實驗介面樣本。受測對象則為年滿45歲之中高齡族群，採「受測者間」之實驗設計方式，於實驗中針對數位相框常用之功能進行實驗任務，並量測其完成操作任務所需之時間，之後要求受測者填寫主觀感受評量問卷、使用者互動滿意度量表(Questionnaire for User Interaction Satisfaction, QUIS)、系統使用性尺度量表(System Usability Scale, SUS)與工作負荷指標量表(NASA Task Load Index, NASA-TLX)。所得之實驗量化資料經SPSS軟體進行統計分析，以歸納結論與建議，期望作為未來相關產品於介面設計上之參考。研究結果歸納如下：
1. 由操作績效之分析結果發現，研究所設定之實驗變數「按鍵功能提示」與「動態回饋」在中高齡使用者對介面熟悉度較差時能發揮較明顯之影響力。
2. 由操作績效之分析結果發現，實驗變數「按鍵功能提示」與「動態回饋」在操作實驗中確實發揮其協助使用者操作之功能，但是二者之搭配須考量是否會因類型過於相近導致互相干擾，反而無法產生效果加乘之效果。
3. 由操作績效與使用者主觀感受問卷之分析結果發現，新設計之按鍵功能提示於操作實驗中對增進操作績效有其一定之助益，但是因應其新設計所造成之操作路徑增加以及因過多訊息造成頁面較為雜亂與擁擠，反讓中高齡使用者產生心理上之壓力，故在提升其介面主觀感受上並無明顯之作用產生。
4. 由操作績效與使用者主觀感受問卷之分析結果發現，由於能提供清楚明瞭之回饋呈現模式且對介面結構與頁面美觀之影響較小，動態回饋設計在提升中高齡使用者之操作績效或是介面主觀感受上皆有良好的評價。
5. 由使用者主觀感受評量與工作負荷指標量表(NASA-TLX)之分析結果發現，動態圖示設計雖然在提升操作績效與介面美觀上有其助益，但是也可能因其畫面不斷變動之特性使中高齡使用者在辨識上需耗費較多之心力。
6. 適度的提供按鍵功能提示與動態回饋可符合中高齡使用者對於數位相框操作介面之使用需求，其中具有美感之介面設計與適量之訊息顯示能提供良好之第一印象，使其能放鬆心情且樂於嘗試操作與了解介面之使用模式。

As the progress and wide spread of digital image technology, traditional way of viewing and sharing image is also changing. The digital photo frame is expected to replace traditional photo album and becomes a way of sharing memory and experience in a family. The design of digital photo album is not limited to a specific user group. Most users with various occupations and different age hierarchies can interact with this product including the elderly users. The purpose of this study is to explore the user interface design of the digital photo frame including: (1) Investigate the user interface design features that can match elderly users’ mental models. (2) Explore potential interaction problems that elderly users may encounter when interacting with the digital photo frame. It is hoped that user interface design principles can be constructed regarding the user interface of the digital photo frame.
The experiment of this study is divided into two stages. In the first stage, three representative digital photo frames that are currently available were chosen to help investigate their interface usability by conducting tasks. Both younger user group (i.e., ages are less than 45 years old) and elderly user group (i.e., ages are larger than 45 years old) were invited to participate in the experiment. Their opinions and potential interaction problems were recorded for further analysis. The results generated from the first stage experiment were: (1) Elderly users were required more assistance when conducting the task. (2) The menu should not be designed with complexity. (3) All the functions should be provided with appropriate hints. (4) The button layout should be rationally designed. (5) The graphic user interface should be supported by texts.
The second stage of the experiment is to conduct tasks by means of the simulated prototype of the digital photo frame. The experiment was designed based on a 3 (button function tips) by 2 (dynamic feedbacks) factorial design. A total of 6 simulated prototypes were created for the experimental purpose. Participants who were more than 45 years old were invited to take part in the experiment which is a between-subjects design. The participants’ task time was recorded during the experiment. After that, they were asked to fill out the Questionnaire for User Interaction Satisfaction (QUIS), System Usability Scale (SUS), and NASA Task Load Index (NASA-TLX). All the data were analyzed by the SPSS. The results generated from the second stage experiment were:
1. Based on the participant’s task performance, the design variables (button function tip and dynamic feedback) can actually help their task when they are not familiar with the design of the user interface.
2. The design of button function tip and dynamic feedback should be used very carefully to avoid the occurrence of interferences.
3. The results from participants’ task performance and QUIS showed that the new design of button function tip can really increase their task performance. However, because of the increase of interaction paths and the cause of overload screen information which increase the participant’s internal pressure, it seems that participants’ subjective feelings were not improved.
4. Because it can provide clear feedback and less affect interface structure and aesthetics, the dynamic feedback can enhance elderly users’ task performance and subjective feelings.
5. The results from the QUIS and NASA-TLX showed that though the dynamic feedback can improve users’ task performance and increase interface aesthetics, it might cause more elderly users’ mental demands because of its changing features.
6. Providing appropriate button function tips and dynamic feedback can match elderly users’ use requirements regarding the user interface of the digital photo frame. In addition, the aesthetic user interface design and suitable amount of interface information can give users better impression which can help the users relax and make them want to find out and understand the use model of the interface.

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