With the advancement in display technology, large displays have become available and more af-fordable. The study investigated the effect of large displays on visual and work performance and associated muscular discomfort. Four sizes (15, 17, 19, and 21-inch) of displays were compared on the subjective preference, task performance, visual strain, neck and shoulder posture and muscle activity. The subjective evaluation results showed that the 19-inch display was preferred by most subjects, compared to the smaller displays. The effect of display size on ocular surface area was significant. There was a tendency that ocular surface increased linearly with the display size, which implied possible visual fatigue for larger displays. Blink rates increased rapidly after one hour of task operation, also indicating visual fatigue. The postural analysis revealed that the display size had no significant influence on the neck angle. Finally, the display size had a significant effect on the average task completion time. In conclusion, the 19 inch display was rec-omrnended for use in extended duration of VDT operation, based on an overall evaluation of the variables investigated.%伴随今日荧幕技术进步,大型荧幕已经成为一种流行趋势.本研究希望得知大型荧幕对视觉、工作绩效之影响,并了解肌肉不适之情形.比较四种荧幕尺寸(15、17、19和21英时)以主观评量、工作绩效、视觉压力、颈肩姿势与肌肉活动之影响.由主观评量得知,19时工作绩效是最好的,荧幕大小对视觉表面积的影响是显著的,在工作超过一小时候,眨眼率与视觉疲劳也大幅增加,颈肩姿势对荧幕大小无显著的,最后,荧幕大小对平均作业时间有显著的影响.结论,19 英时萤幕是我们推荐适用于长时间的作业平台.
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