Effects of viewing distance and local illumination on visual performances with a large projection screen
The usage of digital projectors has increased immensely -both in schools and companies. Compared with the visual display terminals (VDTs), the usage of a projection screen can be simultaneously watched by a large audience from different seats in a room. The use of digital projectors is becoming more popular, but studies about visual performance of digital projector users are rare. The main purpose of this study was to evaluate the effects of viewing distance (3, 6, and 9 m) and local illumination (75, 200, 450, and 750 lx) on visual performance of subjects performing visual tasks with a large projection screen. Each experimental trial included three 40-min work sessions. Each work session consisted of a 10-min proofreading task and a 30-min film watching task. Visual performance measures were obtained for 30 subjects. The results indicated that viewing distance had a significant effect on the proofreading and film-watching performances, but local illumination effect was not significant. There was a tendency to a reduced visual performance with increasing viewing distance. The findings of this study are helpful to design projected text and workplace condition for using a large projection screen.
Projector VDT Proofreading performance
Hsin-ChiehWu Yu-Ching Cheng Hsieh-Ching Chen Cheng-Lung Lee
Department of Industrial Engineering and Management, Chaoyang University of Technology, Taiwan
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-5
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）