Investigating human performance on large Touchscreen :The effect of tilt angle, icon location and icon size

• Main Authors: Chang, Yu-Chiao, 張宥喬
• Other Authors: Lu, Chen-Hui
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/41073103366038098879

碩士 === 實踐大學 === 產品與建築設計研究所碩士在職專班 === 100 === Touch manipulation became a core trend of next technology generation. It is beneficial to user if better touch interface was presented. To discuss this latest trend, this research reviewed literature from technology, industry, and user behavior. In order to understand manipulate performance, there were two experiments conducted in this research. Investigating how the tile angle, icon location, and icon size could affect the human performance in large touch screen. Questionnaire was used to value the user perspective. Statistical analysis was applied to provide a suitable standard to evaluate touch manipulate and adjust the user interface. There were two experiments in this research, using 27” touch display to investigate how display tile angle, icon location, and icon size affect the human manipulate performance. Experiment A was focused on three independent variables: (1) the icon location in the center and corner of screen. (2) Tile angle. (3) Icon size, to observe the user performance. By experiment and the questionnaire, there are three results: (1) The display tile angle is significantly affected the manipulation performance. The mean finished time of 200 tile angle was 35.36 ms fewer than 600 tile angle. (2) Finished time is shorter when the icon is bigger in the screen. When designing the icon, 69-92 pixels were suggested. Between these ranges, user could achieve the best performance, and also the interface was not over occupied. (3) User touch point variation was fewer when the target was in the middle of the screen, while variation was larger when target is in the corner area. Depend on the icon location; touch point variation showed some degree of the direction. Experiment 2 further discussed location touch test in certain scenario such as the 4 corners, icon size and the tilt angle. Basically, this experiment was attempted to find the best performance and make the guideline for designer. By experiment and the questionnaire, there are two results: (1) Observing the corner of screen, participants’ finished tine is shorter when the icon is bigger, but this phenomeono become obscure since 69* 69 pixels. (2) Comparing the corner area of screen, for the right side of screen, the average performance is better than the left side. No matter the finished time, the hallo effect, and the touch point variation are all performance better in right side of scrren. However the finished time decrease more slower when the icon size become bigger. This situation is not obvious for the right side of screen. (3) The pointing difficulty would increase when the icon is at the corner of screen. The finished time and the point variation would all affected by these location, but not the correct rate. The main results of the research are as below: (1) For touch display, the suitable icon size is between 69-92 pixels for different tile angle usage situation. Between these ranges, user could achieve the best performance, and also the interface was not over occupied. (2) No matter under which kind of manipulate situation, touch point variation was towered the center of screen. In order to enhance the user performance, the active area of touch display and the hallo effect area should be corrected tower the center of screen, (3) When the user manipulate the touch display, although the icon size is small, the finished time in the center of screen (350 mm * 120mm) is still better than the finished time of corner area. In order to achieve cost effective, target size in the center of screen can be reduced without side effect. (4) Target around 4 corners required longer response time; however, it would not affect operation correctness and click variation. Important message was suggested to place in the corner. In sum, this research provides the guideline for designing suitable icon in the big touch screen.