二十一世紀至今，行動顯示器 (如iPad、iPhone與All-In-One PC等) 已成為人們最常使用的科技產品之一，隨著行動顯示技術不斷突破與顯示材料的研發，顯示技術已日趨成熟，例如：螢幕亮度對比度的大幅提升，螢幕色域範圍的擴大以及螢幕的耗電量減少等，諸如此類顯示技術的優劣皆是行動顯示器產品競爭力之一。然而，除了硬體層面的技術提升，也需要考量到顯示螢幕傳達至人眼後的視覺感受。例如：人們在不同環境光源下，對於行動顯示器亮度對比度的視覺感受與不同環境光源下，行動顯示器色域範圍中之螢幕白度分析等。本論文使用心理物理學實驗方法來探討各種不同環境光源下之行動顯示器 (iPad Air 2) 的視覺舒適度與行動顯示器色域範圍中之螢幕白度分析，並瞭解行動顯示器螢幕白度對於視覺舒適度之影響。
本論文以一系列心理物理學實驗來探討上述問題。總共有126位受測者參與實驗，其中22位為年長者，104位為年輕人。心理物理學實驗結果歸納如下：對於年輕人而言，不同背景之視覺舒適度會隨著環境光源照度的變化，而有所改變。然而，對於年長者而言，不同背景之視覺舒適度不會隨著照度的變化而改變。顯示器色域範圍中，最高螢幕白度色度座標之色溫會隨著環境光源色溫的改變，而有所改變，且該螢幕色溫會高於環境光源色溫，例如：當環境光源色溫3000 K時，最高螢幕白度色度座標之螢幕色溫為5683 K，當環境光源色溫6500 K時，最高螢幕白度色度座標之螢幕色溫為9400 K。無論在環境光源色溫為3500 K或6500 K，使用該環境光源下，本論文螢幕白度實驗之第二白色度座標作為螢幕背景時，受測者閱讀文章會得到較佳的視覺舒適度。

Since the 21st century, mobile devices (such as the iPad, iPhone and All-In-One PC, etc.) have become the most commonly used computing products. With the development of display materials, display technology has gradually matured. For example, the increasing brightness contrast, the expansion of color gamut and the reducing power consumption for displays. Despite these great efforts made to enhance the hardware, we need to pay attention to the impacts of such efforts on the visual perception when using the mobile display, such as the visual comfort and preference for reading a document and the whiteness perception on a mobile display under various lighting conditions.
A series of psychophysical experiments were conducted to investigate these issues, using an iPad Air 2 as the mobile display in this study. A total of 126 observers, including 22 older observers and 104 young observers, participated in the experiments. The results of psychophysical experiments show that the lightness of the background in a document layout had a significant impact on visual comfort of young observers reading on the mobile display in various lighting conditions. However, there was not such an impact for older observers. The results also show that when the ambient lighting had chromaticities on the Planckian locus with the CCT above 3000 K, the perception of whiteness on the display tended to shift towards a higher CCT than the light source. According to the experimental results, the second whitest display colour is highly recommended as the background colour for e-reading.

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