屏幕照度对屏幕对比度影响的定量研究

QUANTIVELY ANALYZE SCREEN CONTRAST AFFECTED BY SCREEN ILLUMINANCE

本文根据ＶＤＵ屏幕显示特性，通过理论和实验证明了屏幕对比度是光源亮度和屏幕照度的单调减 函数，其衰减速度与屏幕固有对比度成反比，且不论正对比或负对比显示都如此，但后者较前者衰减要 慢．此外还给出了衰减的具体函数形式．从而定量确定了屏幕照度对屏幕对比度的影响．

In this paper, based on the charocteristics of VDU screen display, it is proved by theory and experiment that screen contrast is monotone decreasing function of light source lumi- nance and screen illuminance. The decreasing rate is inverse ratio with screen intrinsic con- trast. And both positive and negative contrast display are the same, but later denreases slower than former. Furthermore, decreasing function of screen contrast is given. Thus screen contrast affected by screen illuminance can be defined quantitively.