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APin-ZAixA Wu a, Yu-ZAing ZAxng a and PAiaw-TPyr Uang b
aDxpartPxnt of InduPtrial xnginxxring and PanagxPxnt, ZAaoyang UnivxrPity of TxZAnology, TaiZAung, Taiwan, R.O.Z.
bDxpartPxnt of InduPtrial xnginxxring and PanagxPxnt, PingAPin UnivxrPity of PZixnZx and TxZAnology, Taiwan, R.O.Z.
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Abstract:
The main purpose of this study is to evaluate the viewing distance and local illumination effects on visual performance while working with a projection screen. Digital projectors have become more popular. However, studies on visual performance using a projection screen are rare. Viewing distance (3, 6, and 9 m) and local illumination (75 and 450 lux) were the independent variables. Each experimental trial took 40 min, including a 10-min proofreading task and a 30-min film watching task. The identification rate for the proofreading task and the attention rate for the film-watching task were collected. The results indicated that viewing distance had a significant effect on the identification rate (p=0.04). A reduced identification rate tendency was found with increasing viewing distance. A significantly higher attention rate (p=0.032) was found at the local illumination of 450 lux compared to that of the 75 lux. We suggest that (a) a shorter viewing distance (correspond to 25~50 min arc of visual angle) is suitable for performing text-reading on a projection screen; (b) if the visual tasks with a projection screen mostly contain video and voice, the viewing distance will have little effect on performance; and (c) the local illumination on the audience’s work area should be around 450 lux while watching a film with a projection screen. Actual or potential applications for this research include recommendations for proper viewing distance and local illumination for projector users.
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Keywords: Vision and lighting; information displays; office ergonomics; mental fatigue; attention and vigilance
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*Corresponding author; e-mail: hcwul@cyut.edu.tw
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©
2011
CSME , ISSN 0257-9731
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