車用影音系統選單畫面資訊呈現之設計研究
Usability Study on the Menu Structure of Car AV System
研究生：林志冠 指導教授：陳建雄
國立台灣科技大學設計研究所 碩士論文

摘 要
汽車的使用在現代人們生活中，除了作為基本交通工具的使用外，汽車內電子系統的進步更深入貼近人們的生活。新式的車用影音系統提供了駕駛者各項資訊，包含整合資訊平台、生活平台、道路平台以及E化平台，讓消費者在行車的過程之中，便能夠透過整合平台，取得路況、衛星導航、音樂、及數位電視娛樂資訊，在目前週休二日的風潮中，有效助於駕駛者於岀遊途中精神上的排遣與娛樂。根據觀察，駕駛者對多功能的車用影音系統使用接受度愈趨增加，也將在未來生活中佔了愈來愈高比例的依賴。
基於車用影音系統於在未來生活中普及率愈趨升高，故以駕駛者對車用影音系統操作觀點，探討其對於影音系統選單之各項互動及操作模式，了解使用者介面設計。本研究先以市售之車用影音系統實際產品為樣本，藉由受測者實車操作及主客觀評價，來驗證相關使用者介面設計之文獻，並從實務操作及理論探討兩方面著手進行研究。
研究進行之第一階段先透過「觀察」及「訪談」的方式，觀察使用者對於車用影音系統使用的外在觀感、設計介面作直觀比較。對於車用影音系統之操作介面的實際需求予以量化，另外為探討現有車用影音系統之操作方式，以三部實際的車用影音系統，由受測者在開車途中進行指定任務操作，以了解現有產品的軟硬體操作介面，對產品的各項優缺點及與使用者互動的方式做評價，以作為未來設計師進行介面互動設計時之參考，內容歸納如下：
(1)獲知車用影音系統之分類及基本功用作為設計之參考值。
(2)對於車用影音系統之現行介面架構進行分析及整理。
(3)了解車用影音系統基本軟硬體介面之需求，模擬設計介面選單。

研究進行之第二階段則依據相關文獻資料及第一階段研究結果，設計出三款不同類型之車用影音系統模擬介面，採三因子實驗設計，即2組(有無使用經驗) X3組(模擬介面選單)，進行指定任務操作作為測試樣本進行實驗。並以SPSS統計軟體分析之資料，及各項認知滿意度評量表 ( NASA-TLX、QUIS、SUS) 印證理論並了解模擬介面間在各項使用者介面設計上之操作績效是否存有顯著的差異，藉由此結果提供未來設計師作為設計參考的依據，歸納如下：
(1) 依據上階段之研究成果以觸控式螢幕為基本架構，設計問卷及模擬介面，並進行任務操作實驗，以獲得三組模擬介面之間是否存有顯著差異值。 三組模擬介面選單，進行測試及問卷後，經SPSS 統計軟體分析印證，在任務操作及NASA-TLX、QUIS、SUS評量中操作績效表現有顯著差異，尤其以「置中跳動式介面(1)」與「置中旋轉式介面(3)」兩模擬介面間最具顯著差異，而「下方放大式介面 (2) 」與「置中跳動式介面(1)」則較無顯著之差異，使用者滿意度都接近，「置中旋轉式介面(3)」選單架構之績效及滿意度表現最差。
(2) 建議設計師們進行設計車用影音系統時，應考慮駕駛者於駕駛行進中的需求，對於介面使用時間過長、色彩對比不清、學習內容冗長困難、文字與ICON難以辨識、選單階層過多等，都應極力避免，以免造成駕駛者於駕駛操作時發生危險。
由於國內車用影音系統對於介面設計及功能整合未臻成熟，歸納的結果有利於設計師了解車用影音系統的使用者在開車途中對操作介面所需要花費的操作時間及辨識性，並瞭解車用車用影音系統在造型設計及人機介面上使用所考慮的差異，期望對於設計者在設計車用影音系統時，更能貼近滿足使用者的需求。
關鍵詞：車用影音系統、互動設計、人因工程、操作績效、使用者滿意度。

Abstract
The improvement of the electronic system in a car is drawn closer to the human life in addition to being a basic transportation means in our daily life. Modern car AV system plays the role of various types of information platforms including information integration platform, life platform, road platform and electronic platform, thus the user will be able to obtain the traffic information, GPS information, music and digital TV programs via the integration of the platforms while driving on roads. The system effectively helps refresh and entertain the drivers during trips on two-day weekends. According to the observations, more drivers are beginning to accept the multi-functional car AV system which will comprise a higher proportion of reliability in the future life.
As the car AV system become more and more popular in our life, based on the driver’s point of view on the car AV system operation, various interactions, operation modes, and user interface design of the user interface menu were investigated. This research study adopts the current car AV system on the market as samples and obtains both subjective and objective opinions from the drivers during the actual driving tests in order to verify the relevant literatures of user interface design.
The first phase of the research focuses on observation and interview. By observing users’ interactions with the form and user interface design of the car AV systems, the actual interaction requirements of the car AV system can be obtained. In addition, in order to investigate the interaction style of the current car AV system, three car AV systems were selected for the testing purpose. Participants would conduct the designated tasks while driving and make comments regarding the pros and cons of the system based on their experience in interacting with the system. Their comments were summarized as the interaction designer’s references. The results are summarized as follows:
(1) Obtain the classification and basic functions of the car AV system to be used as a reference for design.
(2) Perform analysis and generalization of the current interface structure of the car AV system.
(3) Understand the requirements of the basic interface functions of the car AV system and simulate the menu of the designed user interface.
The second phase of the research was performed based on the results of the first phase. Three different kinds of user interface prototypes of the car AV system were created by adopting three-factor experiment design, i.e. 2 (experience levels using the system) of by 3 (user interface menu prototypes). Furthermore, the SPSS, a statistics software was used for data analysis, as well as various assessments for perception and satisfaction (NASA-TLX、QUIS、SUS) were used to verify the theories and help understand the differences in the task performance among the prototypes. The results is summarized as follows:
1. In accordance with the experiment results of the aforementioned phases as well as using touch panels as the basic structure, questionnaires and the user interface prototypes were designed for the experimental purpose. The goal is to find out whether obvious differences exist between the three sets of the user interface prototypes. After collecting the data from tests and questionnaires on three sets of the prototypes, the SPSS was used to help analyze the data. The results show that significant differences exist between the task performance in NASA-TLX, QUIS and SUS assessments. In particular, the two prototype interfaces, “CASE(1)” and “CASE(3)”, reveal significant differences, and the difference between “CASE(2)” and “CASE(1)” is less obvious as both obtain the same satisfaction level. “CASE(3)” is the poorest in terms of the performance of the menu structure and the satisfaction level.
2. The designers, when designing the car AV system, are recommended to consider the requirements of the drivers. Problems such as excessive use of the user interface, vague color contrast, difficult operations, unclear words and icons, and multiple levels of the menu must be avoided, so as to prevent the drivers from running into accidents while operating the system and driving on roads at the same time.
As the interface design and the function integration of the car AV system in Taiwan are not matured, the concluded results will allow the designers to understand the driver’s needs for the car AV system in terms of the required operation time spent on operating the interface while driving as well as the indentify ability of the options on the menu and gain the information on the difference to be considered when designing the form of the car AV system and the human interface operation. It is then expected that the designers will consider more of the user’s needs when designing the car AV system.
Keywords: Car AV system, Interaction design, Human factors, Task performance, User satisfaction.

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