螢幕極性與亮度對比對視覺績效的影響

摘要

本研究旨在探討螢幕極性與亮度對比對辨識力與主觀偏好的影饗，極性分兩個水準，分別爲白底黑藍多爾圏(Landolt-C)及黑底白藍多爾圈，亮度對比分成四個水準1/6、1/3、1/2、2/3分別由10、25、30、35、50cd/m²五種亮度所組成，共有8個處理組合，實驗時螢幕色彩均爲灰色，灰色色彩値爲CIE(0.333,0.333)。本研究結果顯示，螢幕極性不論對受試者的辨識能力或是對主觀評比都沒有顯著的影饗，螢幕的亮度對比對辨識力有顯著的影響，當螢幕亮度對比爲2/3時，其平均辨識視角較亮度對比爲1/6、1/3、1/2時的平均辨識視角爲小，此結果可做爲設計螢幕亮度對比的參考，即應將螢幕亮度的對比設在2/3以上，另外亮度對比與主觀偏好有相關，亮度對比越大，受試者的辨識能力較高，主觀偏好的分數也较高。

Abstract

This study investigated the effects of polarity (white Landolt-C on black background and black Landolt-C on white background) and contrast (1/6, 1/3, 1/2, and 2/3) on visual acuity and subjective preference of subjects performing discriminating task on VDT. Statistical analysis showed that visual acuity and subjective preference were not affected by the factor of polarity. However, contrast was an important factor for visual acuity. Subjects showed significant visual acuity increase when contrast became larger. Based on this finding, contrast seemed to be an important factor affecting VDT work and should be designed larger than 2/3. Further, subjective preference was also affected by the factor of contrast. Subjects showed significant subjective preference increase when contrast became larger.

關鍵字:

• 螢幕極性
• 亮度對比
• 視覺績效。

Keywords:

• VDT
• polarity
• contrast
• visual performance